The chemistry teacher required the students___more attention

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The chemistry teacher required the students___more attention ___the lab clean.A.to pay,to keep
B.to paying,to keeping C.paying,keeping D.to pay,to keeping
求详解

D required sb.to sth.要求某人做某事 pay attention to doing 注意某件事”,对某事加以关注 to为介词用doing doing 可省略
再问： pay attention to doing 是固定词组还是什么
再答：固定的，这俩都是固定的，要记住

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