答案：选D
解析：这句话的时态是一般现在时,主语是Classes,是复数形式,所以谓语动词也要用复数形式
即：Classes begin at 8 a.m.and are over at 4 p.m.
翻译：8点开始上课,下午四点放学.
有不明白的请继续追问,
Classes ____ at 8 a.m.and ____ at 4 p.m A.begin:finishes B .
2个回答
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