单项选择题

Could you tell me ______

A. when did you buy it
B. when you bought it
C. when did you bought it
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单项选择题
How many times has Linda been to Jiaxing
A. Once.
B. Twice.
C. More than twice.
单项选择题
I went to the supermarket ______ a box of milk yesterday.
A. bought
B. buying
C. to buy
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