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He _____ in this factory for 20 years already.
A．will workB．works
C．has workedD．is working
C

試題分析：句意：他已經(jīng)在這家工廠工作20年了。結(jié)合語境可知本句描述的是從過去一直持續(xù)到現(xiàn)在的動作，故用現(xiàn)在完成時態(tài)。選C。
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