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

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

选项

答案 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。

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