题目内容

--Listen! Someone is knocking at the door. Who _____it be?
---It_____be Tom. He phoned to visit me this evening.
A．may;mayB．may;shouldn’tC．must;canD．must;may
A
考查情景交际和情态动词。“听！有人在敲门。会是谁呢？”“可能是汤姆。他打电话说今晚来看我。”may“可能”，表示推测时，表示的可能性没can大；must表推测时，意为“一定”。根据句意可知，第一个空表示的是不肯定，故用may；第二个空也表示“可能”。故选A。
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