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— There'ssomeone knocking on the door. Who _____it be?
— It must be Mary. She promised to be here at 8：00.
A．mustB．needC．shallD．Can
D

試題分析：句意：--有人在敲門�？赡軙钦l呢？--一定是Mary。她答應(yīng)八點鐘到這里。A. must一定，表主觀肯定推測；B. need需要；C. shall將會是；D. can可能，表示懷疑、猜測、驚異（主要用于否定句或疑問句中）。故選D。
考點: 考查情態(tài)動詞的用法。
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