【題目】Be sure to remember that the choices you make are the keys ________ a healthy life.

A.to maintainB.to be maintainingC.to being maintainedD.to maintaining

【答案】D

【解析】

考查非謂語動詞。句意:一定要記住,你所做的選擇是保持健康生活的關(guān)鍵。The key to中的to是介詞,后面接動名詞作賓語,且此處表示主動,故D項正確。

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