题目内容
You _____________be tired—you’ve only been working for an hour.
A.must not B.won’t C.can’t D.may not
答案：C
解析：
解析：
用在否定句中表示推测和判断，用can。must用在肯定句中表示判断和推测。
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You _____ be tired; you have been working for so long a time,
but he _____ be tired; he has just begun to work.
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A．may not; must |
B．must; may not |
C．can’t; must |
D．must; can’t |