摘要:用法: 表示一直持续进行到过去某一时刻的动作, 该动作可能刚刚结束, 也可能还在进行 a. I had been waiting for two hours before the manager came down to see me. b. By the end of 1998 he had been learning English for five years.

网址:http://m.1010jiajiao.com/timu_id_4420991[举报]

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网