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    21、The facts have been _____ from thousands of students in their first year of university study by asking such questions as these．

    A．made         B．differed         C．obtained         D．shaved

    21、C

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    The facts have been _____ from thousands of students in their first year of university study by asking such questions as these．

    A．made         B．differed         C．obtained         D．shaved

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