题目内容

—Look! The boy in the white shirt ___be Tom.
--It ____be him. I saw him enter the library just now.
A．must; can’tB．must; mustn’t
C．may; shouldn’tD．may; mustn’t
A
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。
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