单项选择题

It doesn't matter who solve the problem；what（）is how to solve the problem.

A．counts
B．applies
C．stresses
D．functions

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In dangerous places, you（）take care of your child.

A．can
B．may
C．must
D．will
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
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