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Asweallknowtheworldpopulationhasto6billion.Itisreallyabignumber.A.producedB.providedC.increasedD.invented

题目详情

As we all know the world population has _________ to 6 billion. It is really a big number.

   A. produced       B. provided       C. increased       D. invented

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答案和解析

C