题目内容
6．Computers are used___scientists___working out different problems．（ ）| A． | as；by | B． | to；for | C． | by； for | D． | for；to |
分析 计算机被科学家应用来解答不同的难题．
解答 答案：C．
根据题干可以推断这句话表达的意思是"计算机被科学家应用来解答不同的难题．"其中两个设空处的介词短语表达"被…使用"和"被用来做…"的意思，应该为：be used by 和 be used for，故选C．
点评 此题考查介词短语的用法．做题时联系前后句，抓住关键词和关键句子，把握好句意，结合选项根据介词本身的含义是否符合句意去选择．
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