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    32．- 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 【查看更多】

     

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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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