单选题
When ______, many racists cannot give a logical reason for their attitudes towards other racial groups.
A、
questioning
B、
having been questioned
C、
having questioned
D、
questioned
【正确答案】
D
【答案解析】
when引导时间状语从句，主语为many racists，与question为动宾关系，question用被动形式。
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