情态动词问题:----We didn't see him at the lecture yesterday. ----He ____ it. A.mustn't attend

1.----Wedidn'tseehimatthelectureyesterday.----He____it.A.mustn'tattendB.cannothaveatt... 1.----We didn't see him at the lecture yesterday.

----He ____ it.
A.mustn't attend B.cannot have attended C.would have not attended D.needn't have attended
2. You ____ your lessons yesterday, but you didn't.
A.had gone over B.should have gone over C.should go over D.would go over
一定要有解释啊!!!谢谢大家了!
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  1. 选B cannot have done sth 对过去推测:过去不可能做某事

    A mustn't do 只有不准的意思 C D would/need 句意不对

  2. 选B should have done sth 本应做某事

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