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
B

這題考查過去分詞做定語的用法，carry out“實(shí)施，進(jìn)行”和a study 是被動的關(guān)系，所以用過去分詞做定語修飾a study，句意是：1977年美國進(jìn)行的研究表明阿司匹林里面的化學(xué)物質(zhì)ASA可以防止休克。選B。
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