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
B

試題分析：考查分詞做定語(yǔ)用法。本題中的a study與動(dòng)詞短語(yǔ)carry out構(gòu)成被動(dòng)關(guān)系，故使用過(guò)去分詞做定語(yǔ)來(lái)修飾名詞。句意：由美國(guó)在1977年進(jìn)行的研究顯示阿司匹林里的ASA可以預(yù)防中風(fēng)。故B正確。
點(diǎn)評(píng)：分詞做定語(yǔ)就相當(dāng)于一個(gè)定語(yǔ)從句，當(dāng)分詞做定語(yǔ)的時(shí)候，如果構(gòu)成分詞的動(dòng)詞與名詞構(gòu)成主動(dòng)關(guān)系，就使用現(xiàn)在分詞做定語(yǔ)；當(dāng)二者構(gòu)成被動(dòng)關(guān)系，使用過(guò)去分詞做定語(yǔ)。單獨(dú)的一個(gè)分詞做定語(yǔ)要放在名詞的前面，分詞短語(yǔ)做定語(yǔ)要放在分詞的后面。
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