是He doesn't return the book back.还是He doesn't return back the book.
问题描述：
是He doesn't return the book back.还是He doesn't return back the book.
答
He doesn't return the book .
不加back,因为 ruturn 已经包含了back 的意思.
return sth.to sb.把……还给某人
加油!在写作文，多加个back 就多了一个词！