这是个复合句型 主句是强调句 定语从句修饰chemistry 而he was doing an experiment 为完整句子什么都不缺 因此只能填关系副词 而that是关系代词 可以带主谓宾
It was in the chemistry lab ( where) he was doing an experim
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John must be in the chemistry lab,( 括号里为什么填isnt he?