英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.A.has discovered B.must have discovered C.had discovered D.will

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英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.A.has discovered B.must have discovered C.had discovered D.will
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英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.A.has discovered B.must have discovered C.had discovered D.will
英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.
38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.
A.has discovered B.must have discovered C.had discovered D.will have discovered
为什么

英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.A.has discovered B.must have discovered C.had discovered D.will
D.首先 then 指的是 ten years later,很明显那是将来的时间 而答案中只有一个将来时态 就是D

英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.A.has discovered B.must have discovered C.had discovered D.will Has Mary got a high fever?Does Dr.Smith feel very well? 请问1.Do you think a cat understands people's gestures than does a dog?为什么是does a dog而不是a dog does?2.Perhapes nobody has contributed more to the education than has Dr.Smith.为什么是 has Dr.Smith而不是Dr.Smith has?A whal 几道大学英语选择题,望高手赐教,请说明原因.1、 Having been asked to speak at the convention_____.A.some notes were prepared for Dr.Smith.B.Some notes were prepared by Dr.Smith C.The convention members were pleased to hear Dr.Smith D 英语改错 50分 1.I have caught a bad cold for a week and I can't get rid of it.2.This is all what Dr.Smith said at the meeting.3.He promised to come and see us after the supper.4.John has come here to see you,but he left 5 minutes ago.5.I have he 英语dr怎么读 英语 b-dr--m- 英语短文一篇 速求 求精假如你是Dr Brown ,请你告诉Mr Smith如何戒烟 60-80词 英语TE是什么意思 七上英语新目标3a原文,分别是Huaxing clothes store Runner eats star ed- smith has.Huaxing clothes storeRunner eats star Ed smith has......... 英语句里Ed Smith has a great sports collection.中的a 与sports是否矛盾 since the taxi was late Dr.Smith didn't get to the airport until 11 o'clock missing his flight byfive minutes.中Dr.Smith啥时到机场的,我认为是10：55但是答案上是11:05我学了这么长英语了还不知道because前加逗号.啥时bec Te shopping center has a good n____rt 英语翻译Dr.Smith:You wouldn’t believe it.I started by opening a bank account with$60,000,and my July bank statement has a balance of $240,000.Not bad forseven months—all pure profit.Dr.Wommack:Maybe I’ll try it in Las Vegas.Let’s have bre 英语翻译Dr.Smith:You wouldn’t believe it.I started by opening a bank account with$60,000,and my July bank statement has a balance of $240,000.Not bad forseven months—all pure profit.Dr.Wommack:Maybe I’ll try it in Las Vegas.Let’s have bre dr Dr dr