我在学习期间，我已经学习了经济，地理，数据和数学类。

During my learning period, I have taken classes of economy, geography, data and math.

youdao

我在学习期间，我已经学习了经济，地理，数据和数学类。

During my learning period, I have taken classes of economy, geography, data and math.

youdao