You ______ be tired, for you’ve only been working for an hour.

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问题 You ______ be tired, for you’ve only been working for an hour.

选项 A、must not
B、won’t
C、can’t
D、may not

答案C

解析 “情态动向+动词原形”才能作谓语动词,必须根据说话人语气,情态才能推断正确答案。根据you have only been working for an hour,由此可知选择表肯定的否定C。
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