AstudyintheUSAin1977showedthat

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更新 2022-09-03
科目英语
题型单选题
难度中等
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挑错有奖

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

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