Perhaps John’s not in. Look the light is on.A. Yes he can be at home.B. No he

问题补充：

--- Perhaps John’s not in. --- . Look, the light is 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

解析：考查情态动词表推测。Yes, he is.“不，他在家。”；must表示肯定推测，意为“一定”。故选C。