问题描述： he is happy,because he is g_____ on a trip.怎么填? 1个回答 分类：英语 2014-11-28 问题解答： 我来补答 he is happy,because he is go on a trip.他非常开心,因为他要去旅行. 再问： 不填 going on a trip吗？ 展开全文阅读
