Before a problem can be solved， it must be obvious（）the problem itself is._精华吧

Before a problem can be solved， it must be obvious（）the problem itself is.

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Before a problem can be solved， it must be obvious（）the problem itself is.

A.what

B.that

C.why

D.which

正确答案：what

Tag：科技英语语法时间：2024-01-08 09:43:02

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