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The period when the great painted caves at Lascanx and Arlamira were occupied by upper Poleolithic peoples has been established by canbon 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 magnificatly depicted animals.
D) has been established by carbon dating, but what is much more difficult to determine is
为什么这里用的是is?后面的非划线部分不是还有3个并列的宾语么?但是根据前面的句型,what is much more difficult to determine 后面应该是要跟is的。。。 请教大虾,是我理解错误么?
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