题目内容

【题目】China made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.

A. shall B. may C. must D. should

【答案】A

【解析】

试题解析：考察情态动词的用法，shall在陈述句中表示说话者给对方的承诺、决心、警告、威胁等。句意：中国在哥本哈根峰会上向世界承诺,到2020年,其经济的碳强度下降了40%到45%。故选A.

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