【題目】Exercise is the key ______ your health

A.to improveB.to improvingC.in improvingD.of improving

【答案】B

【解析】

考查固定短語。句意:鍛煉是改善你健康的關(guān)鍵。此處考查短語the key to doing sth……的關(guān)鍵,to是介詞,其后接動名詞,故選B項。

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