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.
读曼哈顿上有说,any comma-ing stuctures are adverbial modifiers,-ed follow the same general rules
可是 OG16上的29题
29. By 1940, the pilot Jacqueline Cochran held seventeen official national andinternational speed records, and she earned them at a time when aviation was stillso 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 manyof the planes she flew to be
(B) earning them at a time that aviation was still so new for many of theplanes she flew to be
(C) earning these at a time where aviation was still so new that many of theplanes she flew were
(D) earned at a time in which aviation was still so new such that many ofthe planes she flew were
(E) earned at a time when aviation was still so new that many of the planesshe flew were
选E,b,c虽然错了可是也是修饰pilot的啊,earned是修饰records。。。所以comma然后-ing也可以是noun modifier咯?~??~?