— Dad, must we wait for the green light?
— Yes, I’m afraid we ________. That’s the traffic rule (规则).
| A．can | B．may | C．need | D．have to |
— Dad, must we wait for the green light?
— Yes, I’m afraid we ________. That’s the traffic rule (规则).
| A．can | B．may | C．need | D．have to |
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