B
定语从句
主句This is the famous scientist.
从句I referred to the famous scientist to you last time.
A错在I referred the famous scientist和you之间没有to连接
C同A少to
D本身意思就有点问题
B
定语从句
主句This is the famous scientist.
从句I referred to the famous scientist to you last time.
A错在I referred the famous scientist和you之间没有to连接
C同A少to
D本身意思就有点问题