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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
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”。
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