新Prep2-166

liliannechang

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

我选了A，但答案是D，为什么。我是看到了determine后跟了 the use.....the reason.....and the meaning, 所以觉得determine后要 are的说，哪位好心人给指导下，谢谢~~~~

zhangfan90

The Sub here is
What is much more difficult to determine.

As per Manhattan SC guide this is called Sub Phrase and it is always singular.

so.用is

xiaoxiaoxxliu

I believe this is kind of agreement for what-clause:
what IS difficult to determine IS
what ARE difficult to determine ARE
no matter what is after the verb.

ashleych

我来解释：：
what 是要引导从句的
1：what 在从句里做主语： 【what is difficult 】is that 这样的，后面这个is由前面那个is 决定 ，就是要跟他一样。
2：what在从句里做宾语： 【what they say 】is XX  这样的，这个is就由后面的XX决定 如果是XX and XX，那就是are了
本题为第一种情况。

reirayanqing

what本身做主语,主句谓语由从句谓语决定 what在从句中做宾语 主句谓语由主句表语/宾语决定
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不好意思我没看懂这句话呢，能具体举例分析下吗？

kinghades

what在这里指代了后面的宾语，所以是做了句子的宾语，那么主句的谓语就由what指代的对象来决定。what指代了三个东西，所以用are

faring56

哦，我也明白了，主谓一致，主谓一致……

xiaohaotoutou

主语从句做主语，谓语一般用单数，当what, who等引导的主语从句含有复数意义时，动词可用复数形式。

这是白勇的解释,但是还是不太明白怎么具体划分.如果有例子就最好了...

weidehou

what引导的主语从句做主语

rt...

what本身做主语,主句谓语由从句谓语决定 what在从句中做宾语 主句谓语由主句表语/宾语决定

一般情况下what从句还是以单数来算的。具体情况具体分析

liliannechang

谢谢~~~~~~~~~