It’s a quarter ________ seven. (   )

A．to

B．in

C．at

翻译下列句子
1. What’s six plus twenty?
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2.50+20=?
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3. Do you know the missing number?
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4. The missing number is twenty.
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We play ________ Saturday. (    )

A．on

B．in

C．at

Where is he ________ (来自)?  (  )

A．from

B．with

How about _______(walk) on the beach?