题目内容

The light is on in Mr. Green’s room. He _______ be at home.
A．mustB．canC．mustn’tD．can’t
A
本题的含义是格林先生房间的灯是开着的，所以他在家的可能性是最大，用一定在家较符合题意，must表示一定的意思，故本题选A。
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