you had better to keep the classroom ______(clean).句子好像是这样的~

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you had better to keep the classroom ______(clean).句子好像是这样的~
you had better to keep the classroom ______(clean).句子好像是这样的~

you had better to keep the classroom ______(clean).句子好像是这样的~
you had better keep the classroom clean.应该没有to