题目内容

—Jane, have you finished your paper?     

—No, I       my sister with her homework all the morning.

A. help     B. have been helping          C. helped            D. was helping

练习册系列答案
相关题目

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