The 2011 International University Games    in Shenzhen now appeals to a lot of people across the world.
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A
held
B
is being held
C
being held
D
to be held
推荐题目
 We looked everywhere for the keys, but they are nowhere _______.
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A
to find
B
to have found
C
to be found
D
being found
Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.
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A
upon which to base
B
which to be based on
C
which to base on
D
to which to be based on