The old man, ________ abroad for twenty years, is on the way back to his motherland.
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A
to work
B
working
C
to have worked
D
having worked
推荐题目
The boy insisted ______ in a nearby school. 
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A
to be taught
B
being taught
C
on being taught
D
on teaching
we were ______ at the news of her sudden death.              
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A
astonishing
B
to astonish
C
astonished
D
astonish