题文
You ______ cross the street when the traffic lights are red．（ ）
| A． |
needn't |
| B． |
don't have to |
| C． |
mustn't |
You ______ cross the street when the traffic lights are red．（ ）
| A． |
needn't |
| B． |
don't have to |
| C． |
mustn't |
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