【題目】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】考查非謂語動詞。句意：不要擔心。為了保持整個系統(tǒng)正常運轉(zhuǎn)，我們正在進行一些努力。此處是動詞不定式做目的狀語，故答案為D。

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