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19.这个实验室是用来做医学研究的.
The laboratoryis used for doing medical research.

分析 从The library作主语来分析语态,联系短语"被用来"解答.

解答 通过对句子"这个实验室是用来做医学研究的"的分析得知The library 作主语,要用被动语态,"被用来"是"be used for",句子的时态是一般现在时态,人称是"三单"be动词用is,故答案是is used for

点评 解答此类题目要根据对句子的分析来确定句子的语态、时态、单复数等.确定语态是本题目的关键所在,也是此题目的难处所在.

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