问题描述： I often hear him _____(cough)when I pass his room. 1个回答 分类：英语 2014-09-29 问题解答： 我来补答 cough 有hear sb do \doing sth两种形式这里有了often说明是经常性的,所以用cough,如果没有often就是填coughing 展开全文阅读
