19. The old man, abroad for twenty years, is on the way back to his motherland.
A. to work B. having worked
C. to have worked D. working
19. B考查非謂語動詞。句意：在國外工作了二十年后，這位老人（已動身）正在歸國途中。不定式作狀語，多表目的和結果，不合句意，排除A、C，分詞作狀語可表時間、方式、伴隨。此處是已完成的主動的動作，不是正在進行當中的主動動作，所以排除D，現在分詞完成式表主動和完成（到謂語動作發生時，非謂語的動作已完成）。由此可知選B。
題目來源：2015全品語法快練高中英語新課標 > 訓練29動詞變化類綜合訓練
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