单项选择题

It's dark in the room. Please _______ the light.

A． turn on
B． turn off
C． turn into
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单项选择题
You _______ be more careful next time.
A． may
B． must
C． have to
单项选择题
--Have you finished your homework--Yes, I’ve _______ finished it.
A． already
B． still
C． ever
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