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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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