[高中] 疑問句改裝的名詞子句

[melsnow ()]

It is unclear __ part of the religious lifestyle causes increased happiness.
(A) that  (B) where  (C) who   (D) what

答案：(D)


根據旋元佑文法書，我的理解是

a. The question is unclear.
b. What part of the religious lifestyle causes increased happiness?

a和b句合併後，將what當成連接詞來用，因此前面不需加that


問題：若以"It + be + adj. + that名詞子句..." 來看，

      that名詞子句為原本的主詞，[That....] is unclear.

      那that則不能省略，如此一來，空格填that what有誤嗎？


      另外有文法書上提到，若adj.為感受性的形容詞，則後面that可省略，

      例：I was surprised (that) she failed the exam.

          請問unclear是歸於此類形容詞嗎？


      該怎麼解釋比較正確呢？感謝各位！


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推 zofloya:"That what..."把兩個連接詞寫一起沒什麼意義，特別是that
→ zofloya:本身就沒意義。
→ zofloya:感受性的形容詞?->不建議背不常用又很中文式定義的術語
推 applepie7691:無先行詞故必用what(=the thing which)
→ applepie7691:It is unclear [which part .....]
→ applepie7691:打錯 It is unclear [what part.....]
→ applepie7691:=[what part .....] is unclear. []內為主詞
→ applepie7691:原it 為虛主詞 與that 無關
→ applepie7691:以it代替原主詞是因為主詞的字太多有後置的現象