两道英语题(有关情态动词的)Black holes _____ not be seen directly,so determining the number of t1)Black holes _____ not be seen directly,so determining the number of them is a tough task.A.canB.shouldC.must haveD.need2)How _____ yo
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![两道英语题(有关情态动词的)Black holes _____ not be seen directly,so determining the number of t1)Black holes _____ not be seen directly,so determining the number of them is a tough task.A.canB.shouldC.must haveD.need2)How _____ yo](/uploads/image/z/14029692-60-2.jpg?t=%E4%B8%A4%E9%81%93%E8%8B%B1%E8%AF%AD%E9%A2%98%EF%BC%88%E6%9C%89%E5%85%B3%E6%83%85%E6%80%81%E5%8A%A8%E8%AF%8D%E7%9A%84%EF%BC%89Black+holes+_____+not+be+seen+directly%2Cso+determining+the+number+of+t1%EF%BC%89Black+holes+_____+not+be+seen+directly%2Cso+determining+the+number+of+them+is+a+tough+task.A.canB.shouldC.must+haveD.need2%EF%BC%89How+_____+yo)
两道英语题(有关情态动词的)Black holes _____ not be seen directly,so determining the number of t1)Black holes _____ not be seen directly,so determining the number of them is a tough task.A.canB.shouldC.must haveD.need2)How _____ yo
两道英语题(有关情态动词的)Black holes _____ not be seen directly,so determining the number of t
1)Black holes _____ not be seen directly,so determining the number of them is a tough task.
A.can
B.should
C.must have
D.need
2)How _____ you say that you really understand the whole story if you have cover only part of the article?
A.can
B.must
C.need
D.may
选哪个?说明一下有没有can have done&should have done&must have done&may have done?
两道英语题(有关情态动词的)Black holes _____ not be seen directly,so determining the number of t1)Black holes _____ not be seen directly,so determining the number of them is a tough task.A.canB.shouldC.must haveD.need2)How _____ yo
1)A 黑洞不能被直接看到,所以确定它们的数量是件艰难的事情
2)A 如果你只是看过文章的一部分,你怎么能说你就真的理解了全文呢?!
没有can have done,有couldn't have done:xxx不可能做了某事
有should/shouldn't have done:xxx本该/不该做某事,却做了/没做某事
有must have done:xxx一定做了某事(对过去肯定的推测)
有may have done:xxx可能做了某事(对过去可能性的推测)
1 A
2 A
后边那三个 都有 但是有没有 can have done 我不清楚 不过我没见过
意思呢大概相同 have done 就是 一般完成时
前边+ 情态动词的话 表一中态度 (推测) “应该能够完成” MUST 的话 同理 “必须完成”
这样....由于 CAN 的 语气比较准确和强硬 不是很适合这种 推测语气
个人见解。...
全部展开
1 A
2 A
后边那三个 都有 但是有没有 can have done 我不清楚 不过我没见过
意思呢大概相同 have done 就是 一般完成时
前边+ 情态动词的话 表一中态度 (推测) “应该能够完成” MUST 的话 同理 “必须完成”
这样....由于 CAN 的 语气比较准确和强硬 不是很适合这种 推测语气
个人见解。
收起
应该只是程度上的差别
A句意上理解黑洞是不能被直接看见的,所以确定它们的数量是艰难的任务
A你怎么能说如果你看这文章的一部分就理解全文了呢
有那些形式can have done 是完成时态的,只不过前面加了情态动词
都是A,但是can 的否定是 cannot 不是can not