It was so lucky that the problem ________ I paid special attention appeared in the exam．A.whichB.to whichC.thatD.to that
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B解析“I paid special attention”作the problem的定语从句，根据搭配pay attention to，引导词应该代替the problem作介词to的宾语，而to可以放在引导词的前面，这样的话就不能用that作引导词。