—I saw Helen in the library this morning. —No it her. She moved to France last week. A.

问题补充：

—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：

解析：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