题目内容
【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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