---Perhaps John's not in.--- .Look.the light's on.A.Yes.he can be at hom
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---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
试题答案
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“对事情的肯定推测”。