The 30th Olympic Games will be held in London _________ July 27 to August 12th , 2012 . 
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on
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in
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at
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from
推荐题目
---________do you spend _English learning every day? ---For about an hour.
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How long, in
B
How many times, on
C
How often, on
D
How long, on
-----______ are the students talking ______? ----- A policeman.
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What, with
B
Who, for
C
Who, to
D
What, to
Thanks for ________ the secret ________ me.
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keep, for
B
keeping, for
C
keep, at
D
keeping, to