—Dad，must we wait until the light becomes green?—Yes, I'm afraid we ________

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1. —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

1. —Dad，must we wait until the light becomes green?—Yes, I'm afraid we _________. That's the traffic rule.