题文
Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .
| A．must | B．mustn’t |
| C．can | D．needn’t |
Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .
| A．must | B．mustn’t |
| C．can | D．needn’t |
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