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
He wrote down______ while he was listening to radio English.
A. several news
B. a number of news C. a few pieces of news
单项选择题
I______ you'll write to me as soon as you can.
A. hope
B. wish
C. want
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