OG-211

[vivid]

211. The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.
(A) has been established by carbon-14 dating, but what is much more difficult to determine are
(B) has been established by carbon-14 dating, but what is much more difficult to determine is
(C) have been established by carbon-14 dating, but what is much more difficult to determine is
(D) have been established by carbon-14 dating, but what is much more difficult to determine are
(E) are established by carbon-14 dating, but that which is much more difficult to determine is

答案B

想請問a 的are 為何不對
因為後面接1. the reason for
2. the use to
3. the meaning of
謝謝

[peche]

the period....has...but what is much more difficult to dertermine is

[fiona]

嗯我第一眼看認為是後面的the reason決定is
可是再回頭看後面有THE REASON THE USE AND THE MEANING
所以我又糊塗拉~~

[rola1225]

有沒有人想過，為何要用現在完成式 ??