Medical researchers are painfully aware that there are many problems ______ (他们至今没有

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Medical researchers are painfully aware that there are many problems ______ (他们至今没有答案).

请帮忙给出正确答案和分析,谢谢!

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  • 正确答案:to which they have not found solutions so far
    to which they have not found solutions so far 解析:本题考点在于以下三点:(1)problems之后应使用定语从句,引导词用which,介词to提前;(2)中文“还没有”需要用增译法,即增加find一词,注意答题时应使用过去分词形式found;(3)中文的“答案”需要转译为solutions。