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

A.mightB.canC.dareD.need

【答案】B

【解析】

考查情态动词。句意:学校延长教学时间来提高学生的成绩,要是在天热的时候,需要开空调这样的做法可能会花费更多的钱。A. might或许,大概;B. can很可能;C. dare敢;D. need需要。此处can是情态动词,表示一时的可能性,故选B

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