【题目】The boy’s dream was to have his own laboratory ________ to try out some of his own ideas.
A． from which B． in which
C． by which D． at which
在线课程【答案】B
【解析】分析句子结构，可知这是一个定语从句。先行词是laboratory，因此必须是in the laboratory。根据句意，可知选B。句意：那个男孩的梦想是有他自己的实验室，在里面他可以试验他的一些想法。