That's all ______ I have seen and heard.A.which B.that C.whe

題目：

That's all ______ I have seen and heard.A.which B.that C.where D.what
這不是個定語從句嗎?先行詞是all等不定式時不是用關係代詞that嗎?爲什麼答案說是D?

解答：

That's all ______ I have seen and heard.A.which B.that C.where D.what
選D
這不是一句局定語從句
定語從句是不缺成分的,這邊從句中【I have seen and heard.】後面缺了成分,即聽到的內容
是一句名詞性從句
所以用what引導