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【题目】Standards in health care have improved greatly when __________ with 40 years ago.

A. comparing B. to compare

C. compare D. compared

【答案】D

【解析】句意:与四十年前相比,医疗保健水平提高了许多。句子主语为standards,与compare之间为动宾关系,用过去分词。

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