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单选题
They regard _____ as their duty to provide the best service for their customers.
A
this
B
what
C
it
D
that
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参考解析
解析：
本题考查it作形式宾语。句意：他们认为为自己的客户提供最好的服务是他们的责任。to provide...是regard的宾语，但为避免头重脚轻，宾语需放句子后面，这里使用it作形式宾语。C为正确答案。
本题考查it作形式宾语。句意：他们认为为自己的客户提供最好的服务是他们的责任。to provide...是regard的宾语，但为避免头重脚轻，宾语需放句子后面，这里使用it作形式宾语。C为正确答案。
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