题目内容
He is supposed ________ abroad, but no one knows which country he was in.
[ ]
A.to be studying
B.to study
C.having studied
D.to have studied
答案:D
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题目内容
He is supposed ________ abroad, but no one knows which country he was in.
A.to be studying
B.to study
C.having studied
D.to have studied