It’s high time we ______ something to stop air pollution.A、are doingB、didC、hav

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问题 It’s high time we ______ something to stop air pollution.

选项 A、are doing
B、did
C、have to do
D、must do

答案 B

解析本题考点为虚拟语气。句型It is(high，about)time that... 要求用虚拟语气，表示应该做而还没做的事，谓语动词一般用过去式。例如：It’s high time that he stopped smoking。

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