[問題]2004年10月Q11(structure)

[Qmermaid]

11. ---- as taste is really a composite sense made up of both taste and smell.
(A)To which we refer
(B)What do we refer to
(C)That we refer to it
(D) What we refer to

answer: D

不清楚為什麼，有人可以幫忙一下嗎 謝謝^^

[HHC]

(A) which 沒有可指代的事物
(B) 不是問句，所以不應加 do
(C) it 沒有可指代的事物