Theperiod when the great painted caves at Lascaux and Altamirawere occupied by Upper Paleolithic peoples has been established by carbondating, but what is much more difficult to determine are the use to which primitivepeoples put the caves, the reason for their decoration, and the meaning of themagnificently depicted animals. A.has been established by carbon dating, but what is much more difficult todetermine are B.have been established by carbon dating, but what is much more difficult todetermine are C.have been established by carbon dating, but that which is much more difficultto determine is D.has been established by carbon dating, but what is much more difficult todetermine is E.are established by carbon dating, but that which is much more difficult todetermine is
[size=13.3333330154419px]楼主选了A,后面the use, the reason这么多并列的玩意为啥用is呢?为啥答案是D……… [size=13.3333330154419px]万万没想到主谓一致也会错……
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