题目内容

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

试题分析：句意：他已经在这家工厂工作20年了。结合语境可知本句描述的是从过去一直持续到现在的动作，故用现在完成时态。选C。
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