他所做的是：经过一段混合班的试运行期后，他改变了学校的政策。
What he did was: After an initial trail period of mixed classes, he changed the school policy.
鉴于以上因素，我们能够得出结论，开展混合班是有益处的。
Taking into account of all these factors, we may arrive at the conclusion that it is beneficial to adopt the practice of a mixed class.
这个夏天，奥马哈公立学校那些教授混合班的老师将接受一次特别的培训。
This summer, OPS teachers who take on multigrade classes will receive special training.
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