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 be determine are
the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.
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
答案是B, 但是我觉得后面后面并列的是the reason, the use and the meaning, 所以不知道为什么不可以用复数?
orh, then what if, like say
When and where are they going to meet REMAIN(REMAINS) a question.
Shall I use Remain or Remains?
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