og上的一道语法题求大神解答一下~~~·谢谢谢谢！！

joanna5200 · 发表于 2013-5-14 18:08:21

og 13: By 1940, the pilot Jacqueline Cochran held seventeen offical 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.
正确答案：earned at a time when aviation was still so new that many of the planes she flew were.
不太明白的一个答案是：earning these at a time where aviation was still so new that many of the planes she flew were. 不太明白这个选项的错误在哪~~求大神解答~~~
麻烦大家帮忙解答一下~~·

og上的一道语法题求大神解答一下~~~·谢谢谢谢！！

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og上的一道语法题 求大神解答一下~~~·谢谢谢谢！！

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og上的一道语法题求大神解答一下~~~·谢谢谢谢！！