【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(dòng)詞。句意：不要擔(dān)心。為了保持整個(gè)系統(tǒng)正常運(yùn)轉(zhuǎn)，我們正在進(jìn)行一些努力。此處是動(dòng)詞不定式做目的狀語，故答案為D。

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