问题补充:
-- Perhaps Toms not in.
-- . Look, the lights on.
A. Yes, he can be at home
B. No, he mustn go out
C. Yes, he must be at home
D. No, he needn go out
答案:
A. Yes, he can be at home
B. No, he mustn go out
(答案→)C. Yes, he must be at home
D. No, he needn go out
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