Question

- Someone is knocking at the door. - It ______ be Tom. He is still in the school. ...

- Someone is knocking at the door. - It ______ be Tom. He is still in the school. A．can’t B．mustn’t C．couldnot D．might; not

Answer 1

A

试题分析：句意：有人在敲门。不可能是汤姆，他还在学校。A 不可能是，表示否定回答；B 禁止；C 不能；D 或许不是。结合语境，选A，表示完全否定的推测。