Question

They were interested ________ you told them．

1. A.
   in which
2. B.
   in that
3. C.
   all that
4. D.
   in everything

Answer 1

D
be interested in sth．“对……感兴趣”。这里，由that或which引导的从句肯定是定语从句，而that或which代替先行词作从句中tell的直接宾语，可以省略；而定语从句一定要有名词或代词充当的先行词，因此只有D项的形式是正确的。A、B项都缺少先行词；C项缺少介词in。