问题补充:
You the work better, but you didn’t put more efforts to it.
A. must have done
B. can have done
C. should have
D. could have done
答案:
A. must have done
B. can have done
C. should have
(答案→)D. could have done
解析:考查虚拟语气。句意:你本可以做得更好,但是你没有付诸更多的努力。could have done本可以做某事;must have done sth一定已经做了某事;should have done sth本应该做某事(实际上未做)。故选D。
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