Aron's arm was caught under
a 360-kilo rock that fell on him when he
was climbing by himself in the mountains.这个句子的when从句是修饰哪个动词啊,是fell还是caught啊另外caught怎么理解啊
...各位老师请教一道题:This is an interview about astronauts when they return to the Earth.请问:1. when引导的从句在句中做什么成分呢?2. 句子中return能否换成returned呢?原题return这里是一个填空,但是答案给的是原形return, 我觉得返回地球是...