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    —There's someone knocking on the door．Who        it be?
    —It must be Mary．She promised to be here at 8：00．

    A．must B．can C．shall D．need

    B

    解析试题分析：句意：--有人在敲门。可能会是谁呢？--一定是Mary。她答应八点钟到这里。A. must一定，表主观肯定推测；B. need需要；C. shall将会是；D. can可能，表示怀疑、猜测、惊异（主要用于否定句或疑问句中）。故选B
    考点: 考查情态动词的用法。

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