Great as Russell was, many of his ideas ______ today and are being modified by t

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问题 Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.

选项 A、are to challenge
B、may be challenged
C、have been challenged
D、are challenging

答案 C

解析时态题。根据逻辑关系首先可以确定应该为被动结构，排除选项A 、D ，又因为这一行为一直延续到现在，所以用现在完成时。正确答案为C 。

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