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

A. to improve B. to improving

C. in improving D. of improving

【答案】B

【解析】

考查固定短語及動(dòng)名詞。句意:鍛煉是改善健康的關(guān)鍵。名詞短語the key to….意為“...的關(guān)鍵,其中to是介詞,后面要接名詞或動(dòng)名詞做賓語。所以動(dòng)名詞improving your healthto的賓語。故B項(xiàng)正確。

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