GMAT Sentence Correction
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Source: OG
Level: 3
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 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
- 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