It’s high time we ______ something to stop traffic accident.

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问题 It’s high time we ______ something to stop traffic accident.

选项 A、do
B、will do
C、did
D、must do

答案C

解析 虚拟语气。It is (high)time that后面的从句谓语动词要用过去式或“should+动词原形”,但should不可省略。选项C符合此结构要求。
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