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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单项选择题
He was free from school,（）he did his homework.

A．after which
B．after that
C．in which
D．in that
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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