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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?
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?
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