问题描述: On finding the engineer was working badly,the pilot had to land.这里的on 1个回答 分类:英语 2014-10-28 问题解答: 我来补答 On 一发现引擎不好使了,驾驶员就不得不着陆.on 一...就.on hearing that ,一听到那个. 展开全文阅读