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by后面可以加定冠词the吗?

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by后面可以加定冠词the吗?
比如:The classroom was been cleaned by the students of Class Two.这个句子我写的对吗?原句子是:The students of Class Two are cleaning the classroom.其实这个原句子我分不清是现在完成时还是一般过去时?请问该怎么写
呃.are cleaning就素现在进行时了~应该这样改:The classroom was been cleaning by the students of Class Two.(神经机械师回答错误了哦~)
by作“被”时可以加定冠词the,但接交通工具时不能接the,只能写by car,by the car是错误的哦~
希望能帮助你~Thanks.