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

解析本题考查的是“作形式宾语。在此句中it作形式宾语，而真正的宾语则是后面的to provide the best service for their customers，这样是为了避免句子头重脚轻。

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大学英语三级A级

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