这是情态动词加完成体的特殊意义
should have done
表示"本应该做某事却未做"
He must have an accident,or he should have been here then.
他一定出事故了,要不然他当时会在这儿了
He must have an accident,or he ( ) here then.
He must have an accident,or he ( ) here then.
A.should have been B.should be C.would be D.were
为什么不选B 怎么看出前半句是过去完成时的?
A.should have been B.should be C.would be D.were
为什么不选B 怎么看出前半句是过去完成时的?
英语人气：153 ℃时间：2020-02-05 20:22:13
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