12．They regard it as their duty_______the best service to the customers．（　�。�
A．to provideB．providingC．provideD．Provided

分析 句意：他們認為給顧客提供最好的服務是他們的職責．

解答 答案A 分析句子可知，此處是it作形式賓語．真正的賓語是動詞不定式to provide the best service to the customers．故選A項．

點評 考查動詞不定式作形式賓語．英語中，為了保持句子的平衡，避免頭重腳輕，常常把真正的主語或賓語置于句末，而用it代替．

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