They regard__________as their duty to provide the best servi

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They regard__________as their duty to provide the best service for their customers. A) this B) what
They regard__________as their duty to provide the best service for their customers.
A) this
B) what
C) it
D) that
选it是为什么?求高人通俗易懂讲解

Cit 做的是形式宾语,代指后面的不定式.
加油!
再问：这种题你是怎么一眼就知道选什么的呢？我总是搞不懂。
再答：把握住考点：it 做形式主语，形式宾语的句式。 regard/think +it +n/adj.+to do sth. regard+it +n/adj.+that 从句

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