问题描述: How did he become an actor?这句中become为什么不是became? 1个回答 分类:英语 2014-10-20 问题解答: 我来补答 因为前面的 助动词 did 已经表明了时态,所以后面的实意动词 become 要用原形.翻译:他是怎样变成一个演员的? 展开全文阅读