15．It's already tens of years____the world's population reached five billion．（　　）
A．beforeB．afterC．since

分析 自從世界人口達(dá)到50億已經(jīng)幾十年了．

解答 答案：C；
根據(jù)設(shè)空處前面的It's already tens of years，聯(lián)系語(yǔ)境可以推測(cè)句意是"自從世界人口達(dá)到50億已經(jīng)幾十年了．"表示"自從"用since；故選C．

點(diǎn)評(píng) 平時(shí)學(xué)習(xí)過(guò)程中，掌握連詞的意思，及所表示的關(guān)系是至關(guān)重要的，這種關(guān)系的判斷可以通過(guò)句子意思的理解來(lái)選擇恰到的連詞．

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