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
He is supposed ______ here by 7:00, but he hasn't turned up yet.
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.
A.to have been
B. to be
C.to havingbeen
D.to being
答案A. 请帮忙说明原因.
英语人气：426 ℃时间：2020-06-25 06:27:06
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