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题库 / Prep2008E2-SC-166
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.
has been established by carbon dating, but what is much more difficult to determine are
have been established by carbon dating, but what is much more difficult to determine are
have been established by carbon dating, but that which is much more difficult to determine is
has been established by carbon dating, but what is much more difficult to determine is
are established by carbon dating, but that which is much more difficult to determine is
题目分析：
旧石器时代的人居住在位于Lascaux与Altamira的巨大的壁画洞的时期已经通过碳测时法确认，但更难确定的是原始人使用什么工具开凿石洞，为什么他们要装饰以及这些华丽的被描绘出的动物所代表的含义。
此处总结一下what从句做主语时，谓语动词的单复数情况：
当what在从句中充当主语时，主句谓语动词的单复数由what引导的主语从句中的谓语动词的单复数决定。例如：
(1) What is difficult to understand is A.
(2) What are difficult to understand are A and B.
当what在从句中充当宾语时，主句谓语动词的单复数由主句的表语/宾语决定。例如：
What his father left him are a few English books.
选项分析：
A选项：but后分句谓语动词应该用单数形式is，what is difficult的is决定主句谓语动词应该用单数is而不是are。
B选项：前半句主语The period和谓语动词have主谓不一致；but后半句主谓不一致错误同选项(A)。
C选项：前半句主谓不一致错误同选项(B)。
D选项：Correct. 本选项在语法和逻辑上均是正确的。
E选项：前半句主谓不一致错误同选项(B)。
替换：
当what引导名词性从句时，其所指的名词通常是单数，谓语动词也是单数。但有时因谓语动词之后有复数名词，谓语动词也可以用复数。
因为what指代那个东西，其是单数还是复数本身是不清楚的，所以通常指单数。而主宾单复数不一致时谓语动词跟主语走，所以即便宾语是复数，what引导的主语从句谓语动词也可以是单数。参考句子：The only thing my father left me was a few books=What my father left me was a few books. 这里也可以变成The things my father left me were a few books=What my father left me were a few books.
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