Classes at 8 a.m.and at 4 p.m A.begin:finishes B .

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Classes ____ at 8 a.m.and ____ at 4 p.m A.begin:finishes B .begins; finishes C.
Classes ____ at 8 a.m.and ____ at 4 p.m
A.begin:finishes B .begins; finishes C.begin.;over D.begin;are over

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,
再问：为什么用are over呢而不用over ? 为什么不用are begin呢？
再答：因为over 是副词，不能直接作谓语，前面要加be 动词；而begin 已经是动词了，前面不必再加be动词了

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