Question

—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

Answer 1

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”。