求问新prep语法166题

zqsyeira

??? ?????? ???? ??? ????? ??????? ????? ?? ??????? ??? ???????? ???? ???????? ?? ????? ??????????? ??????? ??? ???? ??????????? ?? ?????? ??????? ??? ???? ?? ???? ???? ????????? ?? ????????? ??? ??? ??? ?? ????? ????????? ??????? ??? ??? ?????? ??? ?????? ??? ????? ??????????? ??? ??? ??????? ?? ??? ????????????? ???????? ???????? ?? ??? ???? ??????????? ?? ?????? ??????? ??? ???? ?? ???? ???? ????????? ?? ????????? ??? ?? ???? ???? ??????????? ?? ?????? ??????? ??? ???? ?? ???? ???? ????????? ?? ????????? ???
?? ???? ???? ??????????? ?? ?????? ??????? ??? ???? ????? ?? ???? ???? ????????? ?? ????????? ?? ?? ??? ???? ??????????? ?? ?????? ??????? ??? ???? ?? ???? ???? ????????? ?? ????????? ?? ?? ??? ??????????? ?? ?????? ??????? ??? ???? ????? ?? ???? ???? ????????? ?? ????????? ??
答案D
请问but后是什么结构，是主语后置么？为什么不选A用are因为后面是并列的3个东西。有nn可以把but后的句子还原一下么？

zqsyeira

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

不好意思，刚才pdf文件没copy上，不便之处请大家谅解。

zeader

是看what is 的吧，是单数

zqsyeira

是看what is 的吧，是单数

-- by 会员 zeader (2010/9/11 21:16:39)

谢谢回复，but后的主语是what is much more difficult to determine么？

zeader

yes

zqsyeira

yes

-- by 会员 zeader (2010/9/11 23:22:39)

好的，谢啦。