问题

Not until the train pulled into the station that his suitcase was gone.
A:had he found
B:did he find
C:he had found
D:he found
B:did he find
C:he had found
D:he found
正确答案是:
同类题型
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You look puzzled at the news.— Yes. I just can’t imagine _____ he could have donesuch a thing.