题目内容
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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