题目内容
One of the biggest problems in food production has always been that people have no reliable access to exact information, ____________ is often the case in China.
A. that B. what C. which D. it
C

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题目内容
One of the biggest problems in food production has always been that people have no reliable access to exact information, ____________ is often the case in China.
A. that B. what C. which D. it
C