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

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

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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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