og 16 29题review 遇到问题

白冬冬

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 avation 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 were
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   




问题： by＋time, 为何出现了一般过去时？
Ron：
in clauses modified with "by TIME", you should use
the past perfect (had VERBed) if the time marker is in the past
the future perfect (will have VERBed) if the time marker is in the future
if the time marker is "by now", then you should use the present perfect, but that's unlikely to come up in a gmat problem. （http://www.beatthegmat.com/present-perfect-and-past-perfect-usage-summarized-t49438.html）


哭了。原本想快快完看一遍正确句子刷感觉，结果变成了纠错大会。。。。

白冬冬

求nnn ....

xcdamon

如果选项里面有时态的选择问题 出现by time 肯定优先找have/had done

had/have done 和did 的区别就是 一个强调时间上的已经完成 一个强调过去的发生的事情
这里如果今年是1940 我们可以用have done.. 如果今年是1950年 我们应该用 had done. 所以说一定要用had done 也不一定对呢是不是  其次 用did 可能不是最好的 但是肯定不能算错. 简单说一个过去的发生的事情而已
就像大部分的完成时 和 过去式 可以互换一样。

更何况这里 是非划线...

just my thoughts = =/