It’s about time we _______ pouring waste water into the river.

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问题 It’s about time we _______ pouring waste water into the river.

选项 A、had to stop
B、shall stop
C、stopped
D、stop

答案C

解析 考查固定句型It is time…的用法。It is(high/about)time(that)后面的从句谓语动词要用过去式或“should+动词原形”(较少见,且should不可省略)。A项had to stop表示“一定要停止”,B项是将来时,D项动词原形,都不符合条件,答案为C。
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