单项选择题

Lisa was busy taking notes _________ Mark was searching the Internet for the information.

A．until
B．unless
C．while
D．if
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单项选择题
The numbers of students of each class range_________10 to 20.
A．with
B．from
C．up
D．about
单项选择题
Don''t have the water _________all the time while you are out.
A．running
B．run
C．runned
D．runs
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