11．A large number of chemicals are used in modern farming，________ the quality of soil．（　�。�
A．affectedB．affectingC．to affectD．having affected

分析 現(xiàn)代農(nóng)業(yè)中運用了大量的化學物質(zhì)，這影響了土壤的質(zhì)量．

解答 答案：B
解析：根據(jù)句意可知"使用大量的化學物質(zhì)"影響了"土壤質(zhì)量"，前后分句之間是"因果關系"；又因為"使用化學物質(zhì)"與"影響"之間是主謂關系（主動），故直接使用動詞的現(xiàn)在分詞形式作結果狀語．綜上，本題答案為B選項（D選項是完成時，本題并無表達"已經(jīng)影響"之意，只是強調(diào)會"影響"）．

點評 本題考查非謂語動詞，做此類題目時一定要仔細分析句子結構，確定非謂語動詞的形式并根據(jù)句意確定時態(tài)；再結合所給選項確定答案．

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