问题描述: 下列单词的三单形式和过去式:clean give invite learn open skate teach think visit turn 1个回答 分类:英语 2014-10-27 问题解答: 我来补答 cleans cleanedgives gaveinvites invitedlearns learned/learntopens openedskates skatedteaches taughtthinks thoughtvisits visitedturns turned 展开全文阅读