【題目】As its economy is maturing，China’s _________a greater role in critical issues like climate and development.

A. defining B. assuming C. guaranteeing D. assuring

【答案】B

【解析】考查動(dòng)詞。句意：隨著經(jīng)濟(jì)發(fā)展的成熟，中國正在重大問題上承擔(dān)更重要的角色，例如氣候和發(fā)展。defining定義；assuming承擔(dān)；guaranteeing確保；assuring確信，故選B。

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