题目内容

—Is this Toby’s iPhone5，Jenny ?
—No，it________be his. His is black
A. muctn’t        B. can’t        C. may not.
B

试题分析：句意：这是Toby的ipone5吗？不是，肯定不是。他的是黑色的。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……。根据后面的补充可知是否定猜测。故选B
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