单项选择题

I don't know （）you think you are, but you can't talk to me that way!

A. what
B. that
C. when
D. who

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You won't know if you like it （）you try it

A. once
B. for
C. since
D. unless

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Don't forget to bring your umbrella （）you go out

A. since
B. because
C. for
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