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【题目】It is suggested that the key _______ the world's environment should be _______ a low carbon economy right now.

A. to protect; to expand

B. to protecting; to expand

C. of protecting; expanding

D. to protect; expanding

【答案】B

【解析】名词key后面跟介词to,所以后面要跟动名词;扩大低碳经济是将要发生的事,所以用不定式作表语,不能用动名词(动名词表示抽象和经常性的动作)。

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