Most of us have already known the problems----at the meting which wil be held tomorrow atternoon.
问题描述：
Most of us have already known the problems----at the meting which wil be held tomorrow atternoon.
因该选being discussed 还是to be discussed?为什么呢?
答
to be discussed 不定时表示还没有讨论/打算讨论
而现在分词则表示被讨论过了