．Who is knocking at the door?--It Mr. Black, because he Washington.A．can't be;has gone to B．may be;has been toC．must’t be;has gone toD．may be;went 题目和参考答案——青夏教育精英家教网—

．Who is knocking at the door?

——It ______ Mr. Black, because he_______Washington.

A．can't be;has gone to B．may be;has been to

C．must’t be;has gone toD．may be;went

【解析】

试题分析：句意：谁在敲门?肯定不是布莱克先生，因为他去了华盛顿。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……。have gone to去了某地，表示不在这里。根据后文他去了华盛顿可知是否定猜测，故选A。

考点：考查情态动词的用法。

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