题目内容

You           be hungry after the long walk．Help yourself to some cakes．
A．can’tB．shouldn’tC．needD．must
D
考查情态动词的用法。后一句请吃蛋糕，说明“饿”是肯定意思；走了很大的路之后，可以推测出“肯定饿”，因此用must。must be表示猜测时，意思是“一定，肯定”。
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