正確答案應(yīng)該是C選項.表示本能幫助我們卻沒有幫助.
英語中,表達(dá)與過去事實相反的虛擬可以用情態(tài)動詞過去式+have done的形式.
如could have done;本能做而沒做.might have done本可能做而沒做.
should have done 本應(yīng)該做而沒做.must have done本一定要做而沒做.
而在情態(tài)動詞后加not變?yōu)榉穸〞r,表示本沒有...卻做了.
如couldn't have done 本不能做而做了.shouldn't have done 本不該做而做了.
We didn"t finish the work in time. You____us since you were there.
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
A)might help B)should help C)could have helped D)must have helped
英語人氣：369 ℃時間：2019-08-31 14:22:15
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