It was in the lab_________was taken charge of by Johnson_________they did the experiment.A.where; whichB.which; thatC.which; whichD.that; which
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B解析试题分析：第一空是which引导的定语从句，先行词是lab，which在定语从句中主语。第二空是that，是强调句型里的that。这是强调句型其结构是It was+被强调部分+ that+其他，判断强调句型的方法是把It was that去掉整个句子不缺成分，是成立的。考点：考查强调句型及定语从句的用法。点评：本题难度适中。强调句型是高中阶段的重难点之一，它的考查往往与定语从句放在一起，而是句子更加复杂，需要考生有分析理解句子结构的能力。即学即练：It was not until midnight______they reached the camp site. A. that B.when C.while D. as解析：A。该题强干扰项是B，考生容易因强调时间状语until midnight而误选。