问题描述: jack began to learn paintingwhen he was seven 改为现在完成进行时 1个回答 分类:英语 2014-10-09 问题解答: 我来补答 一楼的不是现在完成进行时,那只是简单的现在完成时.现在完成进行时的框架是:sb have/has been doing sth since...应该是 Jack has been learning painting since he was seven 展开全文阅读