问题
选择题
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
答案
答案：D
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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
答案：D