题目内容
---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 |
C
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| A．needn’t | B．mustn’t | C．don’t | D．won’t |
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——No, you . You may do it tomorrow.
| A．needn’t | B．mustn’t | C．don’t | D．won’t |