—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 |
—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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