--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

2．--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

分析 ---有人在敲门．会是谁呢？
---一定是玛丽．她答应8：00到这里的．

解答答案：D
根据本句的语境"There'ssomeone knocking on the door．有人在敲门"以及答语"It must be Mary…一定是玛丽…"得知，"Who _____it be？"应该是表示推测．A must 表示比较肯定的推测，一定，只用于肯定句； B 需要 C shall 在疑问句中表示征求对方意见，主要用于第一、三人称，有"…好吗？"，"要不要"D can 可能，一般用于疑问句或否定句．故选D

点评情态动词表示推测的用法是考查的重点，所以要注意总结表示推测的情态动词的用法及区别．

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