题目内容

— It _______ be Jack who is in the office.
— No, it _______ be him. I saw him off at the airport half an hour ago.
A．can’t ; can’tB．must; can’t
C．must; mustn’tD．may; mustn’t
B
must表推测只用于肯定句；在否定句和疑问句中用can。
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相关题目
If he had not gone out in the storm, he ________ alive now.
A will be                                              B. would be     
C. would have been                                 D. is
Why didn't you tell me there was no meeting today? I______ all the way here through the heavy snow.
A．needn't have drivenB．can't have driven
C．mustn't have drivenD．shouldn't have driven
Let’s clean the classroom, ________?
A．won’t youB．shall weC．do weD．will not you
.—You ____ have set aside more time to play with our kids.
—I wish I ______, but you know how busy I was.
A．should, wouldB．could, didC．might, shouldD．should, had
 —What’s the matter with you ?                   
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A．shouldn’t eat B．mustn’t have eaten
C．shouldn’t have eaten D．mustn’t eat
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
A．might fall outB．could fall out
C．should have fallen outD．must have fallen out
— What does the sign over there read?
—“No person __________ smoke or carry a lighted cigarette，cigar or pipe in this area.”
A．willB．may
C．shallD．must
His failure in the exam suggested that he __________ the teacher’s instructions.
A．can’t have followed B．needn’t have followed
C．mustn’t have followedD．shouldn’t have followed

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