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13、—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

13、B

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—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

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