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    【题目】Don’ t worry. A number of efforts are being made ______ the whole system operating normally.

    A. being kept B. kept

    C. keeping D. to keep

    【答案】D

    【解析】考查非谓语动词。句意：不要担心。为了保持整个系统正常运转，我们正在进行一些努力。此处是动词不定式做目的状语，故答案为D。

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