单项选择题

A．The principle of education in US.
B．Schools in the United States.
C．Children are asked to go to school at a certain age.
D．Elementary education in the United States.
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单项选择题
A．Because repair costs have increased,B．Because they like the courses,C．Because they like plumbing.D．Because the courses cost less.
A．Because repair costs have increased,
B．Because they like the courses,
C．Because they like plumbing.
D．Because the courses cost less.
单项选择题
A．In a university.B．In a library.C．In a bookstore.D．In a supermarket.
A．In a university.
B．In a library.
C．In a bookstore.
D．In a supermarket.
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