Itwouldbecompletelyirresponsibleandunethicaltousedrugsonpeoplethat______(nottest)thoroughlyonanimals.
正确答案:hadnotbeentested解析]过去完成时的被动语态hadnotbeen+过去分词。

Itwouldbecompletelyirresponsibleandunethicaltousedrugsonpeoplethat______(nottest)thoroughlyonanimals.
正确答案: