单选题
They regard ______ as their duty to provide the best service for their customers.
A、
this
B、
what
C、
it
D、
that
【正确答案】
C
【答案解析】
[解析] 考查it作形式宾语。在此句中，it为形式宾语，真正的宾语为to provide the best service for their customers。
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