You________ the work better, but you didn’t put more efforts to it.
A．must have doneB．can have doneC．should haveD．could have done
D

試題分析：考查虛擬語氣。句意：你本可以做得更好，但是你沒有付諸更多的努力。could have done本可以做某事；must have done sth一定已經(jīng)做了某事；should have done sth本應(yīng)該做某事（實際上未做）。故選D。
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