总结这次讨论时,他说双方都要好好考虑怎样以最有效的方法来解决这一问题。
A.
Summing up the discussion, and he said both parties should consider the most effective way to solve the problem.
B.
Summed up the discussion, he said both parties should consider the most effective way to solve the problem.
C.
Summing up the discussion, he said both parties should consider the most effective way to solve the problem.