[問題]2001年1月Q9(Structure) (已收錄)

[jordanmax3]

9.
One theory of the origin of the universe is -------from the explosion of a tiny, extremely dense fireball several billion years ago.
(A)because what formed
(B)the formation that
(C) that it formed
(D) when forming
Ans:C

為什麼不可以選A呢？