问题
选择题
—I saw Helen in the library this morning.
—No, it _________ her. She moved to France last week.
A. can’t be B. can be C. mustn’t be
答案
答案：A
考查情态动词，can’t不可能；can可能；mustn’t禁止。上文，今天早晨我在图书馆看到海伦了。根据后文内容She moved to France last week.她上周去了法国，可推知答案为A