is obvious he has finished his work.A. What; thatB. That; thatC. It; thatD. It; what

问题补充：

is obvious he has finished his work.

A. What; that

B. That; that

C. It; that

D. It; what

答案：

A. What; that

B. That; that

(答案→)C. It; that

D. It; what

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