what do you think of the way he thought of the difficult maths problem ?

问题描述:

what do you think of the way he thought of the difficult maths problem ?
A.to work out B.working outC.wort out D.being worked out
being worked out什么时候用啊

选B working out
What do you think of the way he thought of working out the difficult maths problem?
你认为他想出来的解决这个数学难题的方法怎么样?