题目内容
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
B
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题目内容
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
B