题目内容
The chemistry teacher asked the students ________ more attention _________the lab clean.
A.to pay ,to keep B.to paying ,to keeping
C.to pay , to keeping D.paying ,keeping
C
【解析】
试题分析:句意:化学老师要求学生们要更多关注保持实验室干净。ask sb to do sth,要求某人做某事,pay attention to +名词/动名词,to在这里是介词。故选C。
考点:考查动词不定式和非谓语动词的用法。
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