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It'salreadytensofyearstheworld'spopulationreachedfivebillion.()A.beforeB.afterC.since

题目详情

It's already tens of years____the world's population reached five billion.(  )

A. before

B. after

C. since

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答案和解析
答案:C;
根据设空处前面的It's already tens of years,联系语境可以推测句意是"自从世界人口达到50亿已经几十年了."表示"自从"用since;故选C.