---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：作為兩個兒子的母親你怎么能保持這么苗條？我這些年一直在體育館鍛煉。Work out鍛煉，work on從事；. have been working out現(xiàn)在完成進行時，表示從過去一直到現(xiàn)在進行的動作，有可能還會進行下去。所以選B。
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