I have studied my science test Thursday afternoon.A. at; on B. on; for C. for; on

问题补充：

I have studied my science test Thursday afternoon.

A. at; on B. on; for C. for; on

答案：

解析：在具体的某一天用on，at表示在哪儿，for表示目的原因等，故选C，周四下午我已经为了我的科学考试学习过了。