30．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 【查看更多】

 

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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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