22．If we know more about causes the problem we may take measures before it is late.A. wha

问题补充：

22．If we know more about causes the problem, we may take measures before it is late.

A. what; too

B. which; very

C. that; already

D. that; so

答案：

(答案→)A. what; too

B. which; very

C. that; already

D. that; so

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