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-高中英语-n多题

◎ 题干

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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◎ 解析

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◎ 知识点

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