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【题目】Taking exercise is the key ______ your health.

A. to improve B. to improving

C. in improving D. of improving

【答案】B

【解析】

考查固定短语及动名词。句意:锻炼是改善健康的关键。名词短语the key to….意为“...的关键,其中to是介词,后面要接名词或动名词做宾语。所以动名词improving your healthto的宾语。故B项正确。

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