used to do的用法
问题描述:
used to do的用法
答
used to do 过去常常(表示现在不再) used to do过去常常,过去曾经;过去常常做某事He used to do his homework on Sunday,but now he often does homework on Saturday.他过去在星期天做家庭作业,但是现在他经常在...