求助 新prep sc2---166

maggiexu6262

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


答案选D。 我选A。
请问is或者是are 不是应该由后面的 the use, the reason, and the meaning 来决定吗？
和what is much more difficult 中的is 有关系吗？

zxppx

1.     what引导的名词性从句做主语时，主句谓语动词的单复数情况：
(1)What在从句中做主语，主句谓语由what从句的谓语决定。
             1) What is difficult to understand is A.；What are difficult to understand are A and B.
(2)what在从句中做宾语，主句谓语由主句表语/宾语决定what they want are XX,XX&XX。
2) What his father left him are a few English books.
这道题中，what is more difficult to determine中what是作为主语，所以主句中的谓语由what从句中的谓语is决定，即is

Hugateddybear

顶顶顶！！！求问！！！！！

evlily8783

我也是这么想的啊！！！求NN现身解答！！！%>_<%

happydanni

我的想法和LZ一样啊！！各种不明白。。 求NN解答！

maggiexu6262

自己顶

maggiexu6262

还是不明白，谁能帮我再解释一下啊？

maggiexu6262

LS这里the use, the reason, and the meaning 是并列啊。不是只有一个USE

liufeng881025

what 这里就是 the use 所以用is

maggiexu6262

那请问楼上如果没有is， 比如说是 what implys us 也是加is吗？就是跟着what后面的动词单复数一样吗？