In April, 2009, President Hu inspected the warships in Qingdao, ________ the 60th  anniversary of the founding of the PLA Navy. 
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A
marking
B
marked
C
having marked
D
being marked
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 He is said ________ college in America, studying music.
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A
to be attending
B
that attend
C
to be attended
D
that attending
With his eyes _______ on me, he came towards me.
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A
fixed
B
fixing
C
to fix
D
were fixed
We hope your suggestion will contribute __________ the problem. 
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A
to solving
B
to solve
C
of solving
D
solved