A study ________ in the U.S.A. in 1977 showed that the chemical ASA in aspirin c

A study ________ in the U.S.A. in 1977 showed that the chemical ASA in aspirin c

题型:不详难度:来源:
A study ________ in the U.S.A. in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
A. carrying out    B. carried out    C. working out   D. worked out
答案
B
解析

试题分析:考查分词做定语用法。本题中的a study与动词短语carry out构成被动关系,故使用过去分词做定语来修饰名词。句意:由美国在1977年进行的研究显示阿司匹林里的ASA可以预防中风。故B正确。
点评:分词做定语就相当于一个定语从句,当分词做定语的时候,如果构成分词的动词与名词构成主动关系,就使用现在分词做定语;当二者构成被动关系,使用过去分词做定语。单独的一个分词做定语要放在名词的前面,分词短语做定语要放在分词的后面。
举一反三
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A.to stopB.stoppingC.to have stoppedD.having stopped

题型:不详难度:| 查看答案
________ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.
A.Freed B.Freeing C.To free D.Having freed

题型:不详难度:| 查看答案
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A.developB.to developC.to developingD.Developing

题型:不详难度:| 查看答案
Stop_____ this kind of deer. They are_________.
A.hunting; dying awayB.to hunt; dying out
C.hunting; dying outD.hunting; dying down

题型:不详难度:| 查看答案
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A.to punish B.punishingC.being punishedD.having punished

题型:不详难度:| 查看答案
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