【题目】—Is Professor Smith giving the speech today?
—It ____________ be him. He is abroad right now.
A. needn’t B. can’t
C. wouldn’t D. mustn’t
在线课程【答案】B
【解析】B考查情态动词。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。A. needn't不必；B. can't 不可能；C. wouldn’t将不；D. mustn't禁止。这里根据He is abroad right now.所以确定不可能是他，故选B。