He told us the problems____at the meeting the next day was v

1.答案：B.
2.翻译：他告诉我们说,第二天会上要被讨论的问题非常重要.
3.
1）told us后面的the problems ____ at the meeting the next day was very important是宾语从句,相当于tell sb sth结构的sth.
2）宾语从句中的主语是the problems.而宾语从句的主干是the problems was very important.（楼主可能打错字了,要么是the problem,要么是were very important）
3）而 ____ at the meeting the next day则是后置定语,修饰宾语从句的主语the problems,即“第二天在会议上 ____ 的问题”.
4）所以此时用to be done结构即“to be discussed”,表示尚未发生的被动的动作.
5) 如果选A,表明是“已经被讨论过的问题”,则明显和句意不符.