早教吧 育儿知识 作业答案 考试题库 百科 知识分享

they have been collecting stamps for 10 years在 collecting stamps下画线了 对画线部分进行提问( ) have they ( )( )for 10 years?

题目详情
they have been collecting stamps for 10 years
在 collecting stamps下画线了 对画线部分进行提问
( ) have they ( )( )for 10 years?
▼优质解答
答案和解析
What have they been doing for 10 years?