学校已经开始上课了，所以我有很多事情要做。

Classes have already started, so I have a lot to do.

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这所学校首次为贫民窟孩子提供免费的中等教育，已经在10月开始上课。

In fact, the school—the first to offer free secondary education to children from the city’s slums—opened in October.

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我们赶到学校时，发现已经开始上课了。

Arriving at the school, we found that class had begun.

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