专四
A．stopped
B．had to stop
C．shall stop
D．stop
【解析】考查固定句型It is high time…的用法。It is(high)time(that)后的从句谓语动词要用过去式或 “should+动词原形”，且should不可省略。B项had to stop表示“一定要停止”，C项是将来时，D项动词原形．都不符合条件，所以只能选A。
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