The light is on in Mr. Green’s room. He _______ be at home.
A．mustB．canC．mustn’tD．can’t
A
本題的含義是格林先生房間的燈是開著的，所以他在家的可能性是最大，用一定在家較符合題意，must表示一定的意思，故本題選A。
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