【題目】China is making great efforts _________ people’s living standards（水平）.

A. improve B. improving C. improved D. to improve

【答案】D

【解析】

句意：中國正在努力提高人民的生活水平。A. improve動詞原形；B. improving分詞或動名詞；C. improved過去式；D. to improve動詞不定式。文中提到"making great efforts"做最大努力，固定搭配為make efforts to do sth盡力做某事，故答案選D。

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