问题补充:
----- Perhaps John’s not in.
-----. Look, the light’s on.
A. Yes, he can be at home.
B. No, he couldn’t go out.
C. Yes, he must be at home.
D. No, he needn’t go out.
答案:
A. Yes, he can be at home.
B. No, he couldn’t go out.
(答案→)C. Yes, he must be at home.
D. No, he needn’t go out.
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