2. 外语
  3. The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established b

The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established b

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问题 The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration, the use to which primitive people put the cave,and the meaning of the magnificently depicted animals.
选项 A、has been established by carbon-14 dating, but what is much more difficult to determine are
B、has been established by carbon-14 dating, but what is much more difficult to determine is
C、have been established by carbon-14 dating, but what is much more difficult to determine is
D、have been established by carbon-14 dating, but what is much more difficult to determine are
E、are established by carbon-14 dating, but that which is much more difficult to determine is
答案B
解析 主语the period决定了谓语形式应为单数，因而排除C、D、E；再根据but之后的what从句作主语时要求谓语用单数形式，就可锁定答案B。
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