—Look! The boy in the white shirt be Tom.It be him. I saw him enter the library just no

问题补充：

—Look! The boy in the white shirt be Tom.

--It be him. I saw him enter the library just now.

A. must; can’t

B. must; mustn’t

C. may; shouldn’t

D. may; mustn’t

答案：

(答案→)A. must; can’t

B. must; mustn’t

C. may; shouldn’t

D. may; mustn’t

解析：考查情态动词.句意:看,这个穿白衬衫的男孩一定是汤姆.-不可能是他。我刚才看见他进了图书馆。肯定性推测用must，否定性推测要用can’t。故选A。