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
C
can’t意思是“不可能”，表推测；A不准、禁止；B不愿意；D可能不。
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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.
|
A．may not; must |
B．must; may not |
C．can’t; must |
D．must; can’t |