问题标题:
问一道关于英语时态的问题Theconstructionofthebridge________bytheendofnextmonth.A.musthavebeencompletedB.hasbeencompletedC.mustbecompletedD.mustcomplete我想问一下为什么不选A呢?
问题描述:
问一道关于英语时态的问题
Theconstructionofthebridge________bytheendofnextmonth.
A.musthavebeencompleted
B.hasbeencompleted
C.mustbecompleted
D.mustcomplete
我想问一下为什么不选A呢?
李良应回答:
musthavedone表示对过去的推断,是已经发生了的
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