【題目】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】

試題分析：句意：在過去的半個(gè)世紀(jì)，在農(nóng)業(yè)中使用化肥已經(jīng)很普遍。此處是作主語，故用動詞-ing形式，故選D。

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