求教prep语法一道关于动词的单复数 ^_^

gete999 · 发表于 2010-10-27 10:16:21

The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic peoples has been established by carbon dating, but what is much more difficult to determine are the use to which primitive peoples put the caves, the reason for their decoration, and the meaning of the magnificently depicted animals.

A.has been established by carbon dating, but what is much more difficult to determine are

B.have been established by carbon dating, but what is much more difficult to determine are

C.have been established by carbon dating, but that which is much more difficult to determine is

D.has been established by carbon dating, but what is much more difficult to determine is
E.are established by carbon dating, but that which is much more difficult to determine is

答案就是选D，我误选了A，不太懂后面这个are的由来，如果是根据the use... the reason... the meaning...呃，不懂。

xiaowei0804 · 发表于 2010-10-27 10:40:44

what is much more difficult to determine为一个主语。

求教prep语法一道关于动词的单复数 ^_^

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求教prep语法一道 关于动词的单复数 ^_^

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求教prep语法一道关于动词的单复数 ^_^