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Medical researchers have painfully realized that there are many problems to ________(他们没有找到)any solution so far.(find)

答案:which they haven't found
解析:

考查定语从句。根据结构可知此处应使用定语从句,提示词find以及空格前的to和any solution暗示应使用短语find a solution to;再由so far可知用现在完成时。


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