We have finished the project finally . No one can imagine the difficulty we had the proble

发布时间：2020-08-16 09:17:50

We have finished the project finally . No one can imagine the difficulty we had     the problem,
A. to solve
B. solved
C. solving
D. solve

网友回答

A. to solve
B. solved
(答案→)C. solving
D. solve
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