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问题: 高二英语题——关于情态动词

Put on more clothes.You ( )be feeling cold with only a shirt on.
A.can B.could C.woule D.must

解答:

答案是D. 解释:must be doing/done/adj/n... 表示对现在或将来的推测,而且基本肯定.can/could be...也是表示对现在或将来的推测,但只是有可能,不敢肯定.如:1.Li Hua must be at home,because I called her a moment ago. 2. Where is Li Hua? I don't know. She can be at home.
注意:这种情况下:must be... 的否定形式是can't/couldn't be... 表示推测是没有mustn't be...