题目内容
—I wonder why Jackson was absent from yesterday’s conference.
—He must have been ill, ?
A.isn’t he B.wasn’t he C.didn’t he D.mustn’t he
B

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题目内容
—I wonder why Jackson was absent from yesterday’s conference.
—He must have been ill, ?
A.isn’t he B.wasn’t he C.didn’t he D.mustn’t he
B