問題詳情

40. The professor wrote a book about the keys ___________ the true nature of the universe.
(A) understanding
(B) to understanding
(C) to have understood
(D) of having understood

參考答案

答案：B
難度：適中0.431624
統計：A(57),B(101),C(25),D(28),E(0)

用户評論

【smile5210】評論

key to+ n/ving---答案

【sakura1n530】評論

為什麼B?