问题
选择题
—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
答案
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”。