A study in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
A. carrying out
Bcarried out
C. working out
D. worked out
网友回答
A. carrying out
(答案→)B. carried out
C. working out
D. worked out
解析：
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。