12．Medical researchers are painfully aware that there are many problemsto which they haven't found  answers till today．（find）
醫(yī)學(xué)研究者們痛苦的意識(shí)到，對(duì)于許多問題來說，直到今天他們還沒有找到答案．

分析 醫(yī)學(xué)研究者們痛苦的意識(shí)到，對(duì)于許多問題來說，直到今天他們還沒有找到答案．

解答 答案：to which they haven't found
解析：根據(jù)中文及所給英文題干可知，橫線及其后的部分為定語(yǔ)從句；定語(yǔ)從句的先行詞為problems，根據(jù)the answer（s） to the problem（s）"問題的答案"這一固定搭配可知problems在定語(yǔ)從句中作介詞to的賓語(yǔ)，故定語(yǔ)從句只能使用關(guān)系代詞which引導(dǎo)（不可使用that，因?yàn)橛薪樵~）．又根據(jù)中文"直到今天還沒…"可知，定語(yǔ)的時(shí)態(tài)為現(xiàn)在完成時(shí)．綜上，本題答案為：to which they haven't found．

點(diǎn)評(píng) 本題考查句子翻譯，做此類題目時(shí)一定要根據(jù)中文及英文題干確定需要翻譯的成分，再找出與之對(duì)應(yīng)的英文并考慮各成分是否有形式的改變．

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