题干
— Dad, must we wait until the light become green?
— Yes, I'm afraid we __________. That's the traffic rule.
A：can
B：may
C：have to
答案(点此获取答案解析）
C
— Dad, must we wait until the light become green?
— Yes, I'm afraid we __________. That's the traffic rule.
A：can
B：may
C：have to
