Last month she was explaining to one of her class about sound .这句话有错么

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Lastmonthshewasexplainingtooneofherclassaboutsound.这句话有错么Lastmonthshewasexplainingtooneofherclassabo

Last month she was explaining to one of her class about sound .这句话有错么
Last month she was explaining to one of her class about sound .这句话有错么

Last month she was explaining to one of her class about sound .这句话有错么
Last month she explained to one of her class about sound.
was explainin改为explained

explained就行~ 表示已经发生了.
不是强调过去的某个时间点正在做什么事, 不用"was explaining"

Last month she explained to one of her class about sound
Last month过去时态的标志

One of 后面应该加可数名词的复数,所以应该是one of her classes。 还有就是explained就行了这是过去时不是过去进行时因为last month