12．到目前為止，他們已經(jīng)多次在動(dòng)物身上試用于過這種藥物了．
So far，they havetriedoutthe drug on animals a dozen of times．

分析 到目前為止，他們已經(jīng)多次在動(dòng)物身上試用于過這種藥物了．

解答 答案：tried out
解析：根據(jù)中文及所給英文提示可知，本題考查try out"試用"這一固定短語；又根據(jù)中文"已經(jīng)"及橫線前面的have可知，本題需使用現(xiàn)在完成時(shí)（have/has done結(jié)構(gòu)）．綜上，本題答案為：tried out．

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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