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It's already tens of years ________ the world's population reached five billion.

A. before B. after

C. since D. until

C 【解析】句意:自从世界人口达到五十亿以来,已经有几十年了。考查连词辨析题。四个选项都可用于表示时间。A. before在……之前;B. after在……之后;C. since自从,后接时间段或从句,表示一段时间;D. until直到……才,多与not连用。本句it是形式主语,since引导的从句是真正主语,根据句意结构和语境,可知ABD三项意思都与句意不合,故选C。
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