问题描述: The students were having their chemistry class.有were为什么还有having呢? 1个回答 分类:英语 2014-10-15 问题解答: 我来补答 过去进行时态 was/here+doing have在这是实意动词,上课的意思 再问: was/here是什么意思? 再答: 主语是单数用was,复数用were 展开全文阅读