Question

-- Perhaps Tom’s not in.
-- ________. Look, the light’s on.

A．Yes, he can be at home	B．No, he mustn’t go out
C．Yes, he must be at home	D．No, he needn’t go out

Answer 1

C

考查情景交际。“也许汤姆不在家。”“不，他一定在家。看，灯亮着呢。”Yes是Yes, he is的省略；must表示肯定推测，意为“一定”。故选C。