by时态标志词问题

xiyuzisu

By 1940, the pilot Jacqueline Cochran held seventeen official national and international speed records, and she earned them at a time when aviation was still so new for many of the planes she flew to be of dangerously experimental design.
A and she earned them at a time when aviation was still so new for many of the planes she flew to be
B earning them at a time that aviation was still so new for many of the planes she flew to be
C earning these at a time where aviation was still so new that many of the planes she flew were
D earned at a time in which aviation was still so new such that many of the planes she flew were
E earned at a time when aviation was still so new that many of the planes she flew were （正确）
请教一下各位大神，by+year不是完成时标志词吗，这里为什么不是呢？

一抹斜阳

up up 求解~

xiyuzisu

自己顶一下~~

Butterflyvision

By + present 现在完成时
by + past 过去完成时，1999明显是past 啊