She __________ know the answer, but I"m not sure.A. can B. may
题型：不详难度：来源：
She __________ know the answer, but I"m not sure.
A. can B. may C. must |
答案
| B |
解析
试题分析：句意：她可能知道答案，但是我不确定。must,can(could),may(maight) 可以表示猜测，must 表示肯定猜测，用于肯定句，肯定……，一定……；can’t,表示否定猜测，肯定不……，另外can(could),may(maight)，表示可能性猜测，可能……。根据but I"m not sure.可知是可能性猜测。根据句意，故选B。 |
举一反三
- Must I hand in my exercise book now, Mr. Zhao?
- No, you __. You may give it to me tomorrow.
A. needn"t B. mustn’t C. can"t |
–Dad, _____ we wait until the light becomes green?
--Yes, we ______ . That’s the traffic rule.| A．need, can | B．shall, must | | C．must, have to | D．can, need |
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－Shall we go hiking this Sunday? －Sorry, I _______. I’ll have to take a piano lesson.| A．may not | B．can’t | | C．needn’t | D．mustn’t |
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— It’s the office! So you know eating is not allowed here.
— Oh, sorry. |
— Excuse me , ______ you take a photo for us?
— Sorry, I can’t.| A．can | B．need | C．must | D．should |
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