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When I was a student in the university,I often thought about

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When I was a student in the university,I often thought about whether there ___ a way to prove P=NP.
(P=NP是一个计算科学中的难解问题,现在都没有被证明)
这个题中应该填 is 还是 was?
我记得以前还学过这种句子：
I knew that the earth orbits the sun when I was young.
这个是用一般现在时，表示客观事实。
这两个句子用法有关系吗？
When I was a student in the university,I often thought about
was
从句时态和主句保持一致
你这不是客观事实啊
我们常见的事实是：地球绕着太阳转
光速比声速快什么的
When I was a student in the university,I often thought about 5.WHen I was a student,I often ______ (talk) about the Engla When I was in university,I was very fat.I thought that nice 短文改错It was when I was an university student that I did a lot I often dreamed about Pish when I was a boy 1,When i was (a) university student ,i studied French for a I was scared when I thought about the upcoming year. Now I s 英语翻译I was scared when I thought about the upcoming year.NowI On the bus I saw a student ( ) I thought was your brother. I was a student from the countryside. My teachers thought I 英语翻译When I was a girl ,I thought it was lucky that we ran in 英语翻译About ten years ago when I was a student at college , I