It wasn’t they found that there was much trouble the plan.
A. long before; to carry out
B. long before; carrying out
C. before long; with carry out
D. before long; in carrying out
网友回答
A. long before; to carry out
(答案→)B. long before; carrying out
C. before long; with carry out
D. before long; in carrying out
解析：发表个人意见或看法时，可用短语in one's opinion…。