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The children always talk and laugh,but when the teacher come

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The children always talk and laugh,but when the teacher comes into the classroom they .
The children always talk and laugh,but when the teacher comes into the classroom they _____ their lesson.A.stop to do B.stop doing C.stops to do D.Stops doing
A
这里要区分 stop doing 和 stop to do 的差别
stop to do 表示停下郑子昂做的事去做别的.
stop doing 表示停下正在做的事
题目中说孩子们总是爱讲话爱笑,但是当老师进来的时候他们__ 他们的课,
这样的话肯定是说停下说话笑闹去听课,所以是选A,they是第三人称复数,排除C