Officials from China and France formally promised on Thursday to build a new type of economic partnership, while ________ business cooperation.
A．strengthenedB．to strengthenC．strengtheningD．strengthen
C

試題分析：句意：來自中國和法國的官員在星期四正式許諾在加強(qiáng)商業(yè)活動(dòng)的同時(shí)構(gòu)建新型的經(jīng)濟(jì)伙伴關(guān)系。這里使用了時(shí)間狀語從句的省略式，完整的句子是while they are strengthening business cooperation.當(dāng)主從句的主語一致的時(shí)候，可以省略從句的主語和be動(dòng)詞，所以選C。
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