单项选择题

-- It's 10 o'clock now. I must go.-- It's raining outside. Don't leave______ it stops.

A． when
B． while
C． until
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单项选择题
The red suitcase is expensive ______ it's made of leather.
A． because
B． if
C． though
单项选择题
Henry, don't spend too much time______ TV. You'd better do your homework.
A． watching
B． to watch
C． on watching
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