A study in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.A．carrying outB． carried outC．working outD．worked out 题目和参考答案——青夏教育精英家教网—

题目内容

A study ________ in the USA 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

这题考查过去分词做定语的用法，carry out“实施，进行”和a study 是被动的关系，所以用过去分词做定语修饰a study，句意是：1977年美国进行的研究表明阿司匹林里面的化学物质ASA可以防止休克。选B。

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