You never know how much difficulty we had ______the problem. Luckily, we managed to solve it with Mrs Wu’s help.
A.working out | B.work out |
C.worked out | D.to work out |
You never know how much difficulty we had ______the problem. Luckily, we managed to solve it with Mrs Wu’s help.
A.working out | B.work out |
C.worked out | D.to work out |