【題目】The chemistry teacher required 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

【答案】C
【解析】句意：化學(xué)老師要求學(xué)生注意保持實驗室干凈。require sb to do sth要求某人做某事。pay attention to doing sth注意做某事。故選C。

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