He is supposed ______ here by 7:00, but he hasn't turned up yet.
A.to have been
B. to be
C.to havingbeen
D.to being
答案A. 请帮忙说明原因.
人气：428 ℃ 时间：2020-06-25 06:27:06
解答
A.to have been
be supposed to do 应该做某事
to后跟动词原形,所以CD不对
根据句子意思理解,7点前应该已经在这儿,所以用完成
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