We had a very difficult time ______ some of the problems 选项:a、discussing b、to discuss c、to kn

We had a very difficult time ______ some of the problems 选项:a、discussing b、to discuss c、to kn

题目
We had a very difficult time ______ some of the problems 选项:a、discussing b、to discuss c、to kn
答案
have+ 宾语+宾语补足语
have a very difficult time (in)doing sth
所以用discussing 表示已发生的情况.
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