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
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单项选择题
In dangerous places, you ______ take care of your child.
A．can
B．may
C．must
D．will
单项选择题
______ that she didn't do a good job, I don't think I am abler than her.
A．To have said
B．Having said
C．To say
D．Saying
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