英语：哪个/哪句对?Our classroom must be kept clean everyday.Our clas
英语：哪个/哪句对?
Our classroom must be kept clean everyday.
Our classroom must be cleaning everyday.
Our classroom must be kept cleaned everyday.
Our classroom must be kept cleaning everyday.
Our classroom must be kept clean everyday.
Our classroom must be cleaning everyday.
Our classroom must be kept cleaned everyday.
Our classroom must be kept cleaning everyday.
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we must keep our classroom( ).
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你能帮帮他们吗