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The old man, _______ abroad for twenty years, is on the way back to his motherland.?

A. to work　  B. working ?

C. to have worked 　 D. having worked?

The old man, ____________abroad for twenty years, is on the way back to his motherland.

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

The old man, ________ abroad for twenty years, is on the way back to his motherland.

The old man, ______ abroad for twenty years, is on the way back to his motherland.

The old man, ______ abroad for twenty years, is on the way back to his motherland.

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