The most important thing we should pay attention to is the first thing I have said.A. wh

问题补充：

The most important thing we should pay attention to is the first thing I have said.

A. which, that

B. that, which

C. which, which

D. that, that

答案：

A. which, that

B. that, which

C. which, which

(答案→)D. that, that

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