题目内容

Four hundred dollars for just a pair of shoes? You ______ be joking!
A．mayB．canC．can’tD．must
D
四百美元仅能买一双鞋？你一定是在开玩笑。May可能 can能 can’t不能 must必须。非常有把握的肯定性推测，要用情态动词must。
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