A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke. ...
2023-01-23 05:42:56 127次 2013届安徽省高二3月月考英语试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
A study ________ in the USA in 1977 showed
that the chemical ASA in aspirin could prevent a stroke.
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A．carrying out
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B． carried out
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C．working out
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D．worked out
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