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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Which is Lucy's bag, the yellow one ______ the red one
A．and
B．but
C．or
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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