---Dad, must we wait until the light becomes green?---Yes, I’m afraid we ______.
题型：不详难度：来源：
---Dad, must we wait until the light becomes green?
---Yes, I’m afraid we ______. That’s the traffic rule.| A．can | B．may | C．have to | D．need |
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答案
| C |
解析
| must的含义是必须一定，其否定形式mustn’t表示禁止的含义。故must的否定回答一般借助于needn’和don’t have to来构成，句意:爸爸，我们必须等到绿灯亮了吗？——是的，恐怕我们必须这样做。这是交通规则。结合语境可知选C。 |
举一反三
——Who’s the man over there?Is it Mr. Black?
——It______be him. He’s much taller.| A．may not | B．can’t | C．will not | D．mustn’t |
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— You used to the bus to school, didn’t you?
— Yes, I did. However, I am used to to school now.| A．take; walk | B．take; walking | C．taking; walking | D．taking; walk |
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_Could I go to the movie this Sunday, Dad?
Yes, you_____. But you ______ come back before nine.| A．should, can | B．must ,have to | | C．can , have to | D．need, must |
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—Hurry up , or you ________ catch the train. | A．can’t | B．needn’t | C． mustn’t | D．shouldn’t |
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| There"s only one day to go. You _____ finish your schoolwork by tomorrow. |
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