--- 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 homeD．No, he needn’t go out
C
考查情態(tài)動詞表推測。Yes, he is.“不，他在家�！�；must表示肯定推測，意為“一定”。故選C。
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