问题补充：
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
答案：
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 ones opinion…。
