单项选择题

It is important for everyone ______ learn English.

A．by
B．when
C．to
D．how
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单项选择题
This is the place ______ I used to camp when I was younger.
A．what
B．when
C．where
D．which
单项选择题
At the end of the night the girls were fast ______.
A．asleep
B．sleeping
C．sleep
D．slept
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