We didn"t finish the work in time. You____us since you were

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We didn"t finish the work in time. You____us since you were there.
A)might help B)should help C)could have helped D)must have helped

正确答案应该是C选项.表示本能帮助我们却没有帮助.
英语中,表达与过去事实相反的虚拟可以用情态动词过去式+have done的形式.
如could have done;本能做而没做.might have done本可能做而没做.
should have done 本应该做而没做.must have done本一定要做而没做.
而在情态动词后加not变为否定时,表示本没有...却做了.
如couldn't have done 本不能做而做了.shouldn't have done 本不该做而做了.

We didn"t finish the work in time. You____us since you were ( ) enough time ,we didn't finish the work. If you didn't help me,I couldn't finish the work in time.(改为 We didn't have enough time.We couldn't finish the work.(合并句子 We didn't have enough time.We couldn't finish the work .(合并句 I didn't finish the work on time.Alice didn't didn't finish --I didn't think you could finish the work on time -- To tel 求翻译we can't finish the work in time .I think two more people Because he didn't finish the work on time and was fired by t he did't plan his time well .he didn't finish the work can you finish the work in the_________(little) time He failed to finish the work on time.=He didn't _______ ____