In the reading room, we found her seated at a desk, her attention ____ on a novel.
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A
fixing
B
to fix
C
fixed
D
having fixed
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 The project__________, my colleagues and I had a party to celebrate it.
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A
completed
B
was completed
C
had completed
D
completing
I have two elder brothers, ____ in the army for ten years.
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A
the elder of whom served
B
the older having served
C
the older of which served
D
the elder one has served