---Dad, must we wait until the light becomes green?
---Yes, I’m afraid we ______. That’s the traffic rule.
A．canB．mayC．have toD．need
C
must的含義是必須一定，其否定形式mustn’t表示禁止的含義。故must的否定回答一般借助于needn’和don’t have to來(lái)構(gòu)成，句意:爸爸，我們必須等到綠燈亮了嗎？——是的，恐怕我們必須這樣做。這是交通規(guī)則。結(jié)合語(yǔ)境可知選C。
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