46.I don't know when he ____a__,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么选A?

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46.I don't know when he ____a__,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么选A?
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46.I don't know when he ____a__,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么选A?
46.I don't know when he ____a__,but when he ______,I'll let you know.
A.will come/comes B.comes/will come
C.comes/comes D.will come/will come
为什么选A?

46.I don't know when he ____a__,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么选A?
把这句话翻译后就是：
我不知道他何时会来,但当他来时,我会通知你.
这句话说明了,‘他’还没来,但‘将会来’.在这四个选项里,只有 a 和 d 的第一组词有‘将’（will).
之所以选a是因为comes 回比 will come 来的正确.“will' 在后半句里带有肯定的成分,但‘我’并不肯定他会不会来.
所以a是正确的.

后面用单三能看懂吧,你得看句子的中文意思,后半句可以看出来"他还没来",因为有will~所以前面用将来时~

I don't know when ( ) famous I don't know when leave 还是I don't know when to leaf I don't know when I have been loving 改错 I don’t know when will they come I don’t know when we shall start the work. 英语翻译I don't know when( )for Shanghai.(leave) when it left scars can heal~i don't know~ But I don't know when he---------(go to bed) I don't know. “i don't know you know i don't know i don't know when the managerI don't know when the manager -----(return),but when be ----(come)back i ---(let)you know. I don't care when you leave because you don't know cherish me 什么意思 ? I don't know when we shall start.(改为简单句) I don't know ____ ____ ____. I don't know when we should leave for Nanjing.I don't know when______ _________ __________Nanjing I don’t know when he (arrive). When he (arrive) here, I will call you. I don't know when he ____,I must talk to him when he____.(come) I don't know when I can (arrive)I don't know when I can (arrive) at the hospital用所给词的适当形式填空 I really don't know when I will start my trip=I really don't know_ _ _my trip.