问题补充:
--Is Professer Smith giving the speech today?
--It be him. He is abroad right now.
A. mustn
B. needn
C. won
D. can
答案:
A. mustn
B. needn
C. won
(答案→)D. can
解析:句意:--史密斯教授今天做演讲吗?--那是不可能的,他现在在国外。mustn 禁止; needn 不必;won 将不;can 不可能。这里根据He is abroad right now.所以确定不可能是他,故选D。