----There's someone at the door.Who____ it be Is it the post

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----There's someone at the door.Who____ it be Is it the postman?
----No,It _____be him.It's just 7 o'clock.It' too early
A can; can't B will won't C may mustn't D may not ; must

答案：A
翻译：
--门口有个人,会是谁了?是邮递员吗?
--不,不可能是他.现在才7点,还早了.
can't 表示否定的推测,表示“肯定不是,一定不是”.而must 表示“必须,肯定”的意思.may 表示“可能,可以”,will 表示“将要”.所以正确答案是A.

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