he would return back at 2 o’clock this afternoon这句话可以变为would

he would return back at 2 o'clock this afternoon这句话可以变为would be back
这道题给的答案是将back去掉,
我觉得用would be back也行啊

原句好像有错,return有“返回”的意思,和back重复了.
He would return at 2 o'clock this afternoon.= He would be back at 2 o'clock this afternoon.