She[ has returned][ back] her book to the school [library].哪处有错误

She[ has returned][ back] her book to the school [library].哪处有错误
She[ has returned][ back] her book to the school [library].哪处有错误

She[ has returned][ back] her book to the school [library].哪处有错误
去掉back
加油!不明白再问!

e
这个。。。。。。
不确定
错了吗？？

应将back去掉，因为return to=give back to，在这句话中重复了。