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12.到目前为止,他们已经多次在动物身上试用于过这种药物了.
So far,they havetriedoutthe drug on animals a dozen of times.

分析 到目前为止,他们已经多次在动物身上试用于过这种药物了.

解答 答案:tried out
解析:根据中文及所给英文提示可知,本题考查try out"试用"这一固定短语;又根据中文"已经"及横线前面的have可知,本题需使用现在完成时(have/has done结构).综上,本题答案为:tried out.

点评 本题考查句子翻译,做此类题目时一定要根据中文及英文题干确定需要翻译的成分,再找出与之对应的英文并考虑各成分是否有形式的改变.

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