单项选择题

______ I don't know much about internet, I find it is really useful.

A．As
B．Since
C．If
D．While
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单项选择题
Ann ______ the piano hard for long and now she is a successful pianist.
A．practices
B．is practicing
C．has practiced
D．practiced
单项选择题
In dangerous places, you ______ take care of your child.
A．can
B．may
C．must
D．will
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