Uncle sam ——(become)a worker in a factory in 1980, and 和 ——(work)there since then.用适当形式填空

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Uncle sam ——(become)a worker in a factory in 1980, and 和 ——(work)there since then.用适当形式填空

Uncle sam ——(become)a worker in a factory in 1980, and 和 ——(work)there since then.用适当形式填空
Uncle sam ——(become)a worker in a factory in 1980, and 和 ——(work)there since then.
用适当形式填空

Uncle sam ——(become)a worker in a factory in 1980, and 和 ——(work)there since then.用适当形式填空
became had been working

became have worked