单项选择题

They learned a little Chinese______ they were in China.

A. as
B. since
C. while
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单项选择题
Sara is a friend of ______ and I feel happy about it.
A. me
B. myself
C. mine
单项选择题
______ Yes, I want to buy a blouse(短上衣)for my daughter.
A. Hello.

B. What do you like

C. Can I help you
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