题目内容

—Is Pro. Smith giving the speech today?
—It __________ be him. He is abroad right now.
A．can’tB．needn’tC．won’tD．mustn’t
A
这题考查情态动词的用法，这里的can’t表示 推测，表示“不可能”，句意是：--斯密斯教授今天做演讲吗 ？--不可能是他。他现在在国外呢？选A。
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