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    【题目】Over the past half century, ________ chemical fertilizers has become very common in farming.

    A. having usedB. useC. used D. using

    【答案】D

    【解析】

    试题分析：句意：在过去的半个世纪，在农业中使用化肥已经很普遍。此处是作主语，故用动词-ing形式，故选D。

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