I'll tell you _What__he told me last week.这是一个宾语从句What he told me last week
如果你要用.which ,必须要有先行词,可以把句子改为I'll tell you a secret _ which__he told me last week.
I'll tell you _What__he told me last week.这是一个宾语从句What he told me last week
如果你要用.which ,必须要有先行词,可以把句子改为I'll tell you a secret _ which__he told me last week.