Mr. Smith, ______ in the factory for thirty years, is on the way back to his village.
A．to workB．working
C．to have workedD．having worked
D

試題分析：考查非謂語(yǔ)動(dòng)詞。for+一段時(shí)間，常與完成時(shí)連用，根據(jù)“for thirty years”可知，史密斯先生已經(jīng)在這家工廠工作了30年，having worked相當(dāng)于who has worked。故選D。
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