-- Perhaps Tom's not in.
-- . Look, the light's on.
A. Yes, he can be at home
B. No, he mustn't go out
C. Yes, he must be at home
D. No, he needn't go out
网友回答
A. Yes, he can be at home
B. No, he mustn't go out
(答案→)C. Yes, he must be at home
D. No, he needn't go out
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