题目内容

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

分析 现代农业中运用了大量的化学物质，这影响了土壤的质量．

解答 答案：B
解析：根据句意可知"使用大量的化学物质"影响了"土壤质量"，前后分句之间是"因果关系"；又因为"使用化学物质"与"影响"之间是主谓关系（主动），故直接使用动词的现在分词形式作结果状语．综上，本题答案为B选项（D选项是完成时，本题并无表达"已经影响"之意，只是强调会"影响"）．

点评 本题考查非谓语动词，做此类题目时一定要仔细分析句子结构，确定非谓语动词的形式并根据句意确定时态；再结合所给选项确定答案．

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45．A．ShowB．ShowingC．ShownD．to show
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48．A．MeaningB．ideaC．problemD．way
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