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3.There are several factors _______ in the economy _______ make it difficult to predict the future.(  )
A.operate; whereB.operating; which
C.to operate; thatD.operated; what

分析 有多种因素在经济中起作用,这使得预测未来很难.

解答 答案是B;本题考查非谓语动词及定语从句.第一空需要的是factors的定语,factors与operate的关系为主动关系,用现在分词;第二空为定语从句,先行词为factors,在定语从句中作主语,故选用which,答案是B.

点评 选择定语从句中的关系词,首先要理解各关系词的用法;然后找准先行词,将先行词带入到定语从句;最后根据先行词在定语从句中的作用判断关系词.

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