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

发布时间：2020-08-15 02:56:22


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

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(答案→)A. what; too
B. which; very
C. that; already
D. that; so
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