—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
C
由“Look，the light's on”可知他此刻一定在家里，所以用must be at home表示“對事情的肯定推測”。
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