--Have you graduated from College ?\
---Yes,_____。
A。 I studied French for two years 。
B。 I had studied French for two years。
答案选A。
为何不能选B。我可以这么理解呀,
I had studied French for two years before I graducated from college。
为何错呢?谁能帮我解释一下。具体些。最好能举些例子????。