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商業(yè)活動的同時構建新型的經濟伙伴關系。這里使用了時間狀語從句的省略式，完整的句子是while they are strengthening business cooperation.當主從句的主語一致的時候，可以省略從句的主語和be動詞，所以選C。
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