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necessary
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单项选择题
A．Doing homework.B．Fine, thank you.C．Very good.D．Writing a book.
A．Doing homework.
B．Fine, thank you.
C．Very good.
D．Writing a book.
单项选择题
A．Director.B．Teacher.C．Father.D．Student.
A．Director.
B．Teacher.
C．Father.
D．Student.
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