她在九点半完成了作业。

She finished it at half past nine.

youdao

昨晚九点前我就完成了作业。

I had finished my homework before nine o 'clock last night.

youdao

昨晚九点前我们已完成了工作。

We had finished the work by nine o 'clock yesterday.

youdao

昨晚九点前我们已完成了工作。

We had finished the work by nine o 'clock yesterday.

youdao