來(lái)源:網(wǎng)絡(luò)資源 2021-12-12 19:54:33
情態(tài)動(dòng)詞+have done的用法
must have done sth.一定做某事
can/could have done sth.本來(lái)能夠做某事,而實(shí)際上未做
can't/couldn't have done sth.不可能做過(guò)某事
ought to/should have done sth.過(guò)去本應(yīng)該做某事而實(shí)際上并沒(méi)有做
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