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(yùn)用了大量的化學(xué)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(xué)物質(zhì)"影響了"土壤質(zhì)量"，前后分句之間是"因果關(guān)系"；又因?yàn)?使用化學(xué)物質(zhì)"與"影響"之間是主謂關(guān)系（主動(dòng)），故直接使用動(dòng)詞的現(xiàn)在分詞形式作結(jié)果狀語．綜上，本題答案為B選項(xiàng)（D選項(xiàng)是完成時(shí)，本題并無表達(dá)"已經(jīng)影響"之意，只是強(qiáng)調(diào)會(huì)"影響"）．

點(diǎn)評(píng) 本題考查非謂語動(dòng)詞，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，確定非謂語動(dòng)詞的形式并根據(jù)句意確定時(shí)態(tài)；再結(jié)合所給選項(xiàng)確定答案．

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