【題目】Over the past half century, ________ chemical fertilizers has become very common in farming.
A.having used
B.use
C.used
D.using

【答案】D
【解析】考查動名詞。句意：在過去的半個世紀(jì)，在農(nóng)業(yè)中使用化肥已經(jīng)很普遍。此處是作主語，故用動名詞形式，故選D。

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