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：自從世界人口達到五十億以來，已經(jīng)有幾十年了。考查連詞辨析題。四個選項都可用于表示時間。A. before在……之前；B. after在……之后；C. since自從，后接時間段或從句，表示一段時間；D. until直到……才，多與not連用。本句it是形式主語，since引導的從句是真正主語，根據(jù)句意結構和語境，可知ABD三項意思都與句意不合，故選C。
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