p87/50 I'll tell you all( )I have learned about the accident.(what/which/whom/ \)

问题描述:

p87/50 I'll tell you all( )I have learned about the accident.(what/which/whom/ \)
这题应该选择什么,另外再说说其它3个不能选的理由.

\是对的.
定语从句的先行词是all,是物,关系代词只能用that.本题的关系代词在从句里做宾语,可以省去.

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