They had already had breakfast before they arrived at the school.
在他们到达学校之前，他们已经吃早饭了。
When they arrived at school, the wind blew stronger.
当他们到学校时，风正刮得厉害。
They arrived at school an hour later. The test was finished.
一个小时之后她们来到学校，考试已经结束了。
They arrived at school an hour later. The test was finished.
一个小时之后她们来到学校，考试已经结束了。
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