Until recently, most of the research was conducted, was done using questionnaires.

直至最近，多数完成的研究，使用的都是问卷方式。

哈佛公开课 - 幸福课课程节选

Raul, there was recently a study done about cell phone use by a driver when people are driving a car, and there was a debate whether that should be banned.

劳尔，最近有一项,关于司机开车时使用手机的研究，关于是否应该禁止此行为，有一场争论。

耶鲁公开课 - 公正课程节选