- 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 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．must

B．need

C．shall

D．Can

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D。
考点: 考查情态动词的用法。

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