题目内容

The boy on the playground ____ be Tom, because he saw him in the library just now.
A．mustB．can'tC．canD．might
B

试题分析：根据因为我刚才在图书馆看到他了。可知在操场的那个男孩肯定不是汤姆。
must,can(could),may(maight)，must,can(could),may(maight) 可以表示猜测，must 表示肯定猜测，用
于肯定句，肯定……，一定……；can’t,表示否定猜测，肯定不……，另外can(could),may(maight)，表示
可能性猜测，可能???。根据句意故选B
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