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---How can you keep slim as a mother of two sons?
---I _______ in the gym for years.
A.have worked out B.have been working out
C.have worked on D.have been working on
B
句意:作为两个儿子的母亲你怎么能保持这么苗条?我这些年一直在体育馆锻炼。Work out锻炼,work on从事;. have been working out现在完成进行时,表示从过去一直到现在进行的动作,有可能还会进行下去。所以选B。
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