Mr. Smith, in the factory for thirty years, is on the way back to his village.A．to workB．workingC．to have workedD．having worked 题目和参考答案——青夏教育精英家教网—

Mr. Smith, ______ in the factory for thirty years, is on the way back to his village.

A．to work	B．working
C．to have worked	D．having worked

试题分析：考查非谓语动词。for+一段时间，常与完成时连用，根据“for thirty years”可知，史密斯先生已经在这家工厂工作了30年，having worked相当于who has worked。故选D。

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