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    20、Schools have been lengthening the school day or added days to raise test marks, which      be costly if schools need air conditioning on hot days.

    A．might           B．can           C．must          D．need

    20、B

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    Schools have been lengthening the school day or added days to raise test marks, which      be costly if schools need air conditioning on hot days.

    A．might           B．can           C．must          D．need

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