摘要：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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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 |
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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