2. 外语
  3. They regard ______ as their duty to provide the best service for their customers.

They regard ______ as their duty to provide the best service for their customers.

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问题 They regard ______ as their duty to provide the best service for their customers.
选项 A、this
B、what
C、it
D、that
答案C
解析 本题考查it充当形式宾语的用法。本题真正宾语是动词不定式，故C项为正确答案。
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