【題目】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：與四十年前相比，醫(yī)療保健水平提高了許多。句子主語為standards,與compare之間為動賓關(guān)系，用過去分詞。

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