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Unit 1 Great scientists Ⅰ.单项填空 1．He became inspired when he thought about helping ordinary people________to cholera. A．expose B．exposed C．exposing D．to expose 解析 expose“使暴露于；显露；使接触”，在此处作后置定语修饰people，二者存在动宾关系，故用过去分词形式。 答案 B 2．When he came back three hours later，they were still sitting on the sofa，________in conversation. A．absorbing B．absorbedC．to absorb D．to be absorbed 解析 考查非谓语动词。句意：当他三个小时后回来时，他们仍坐在沙发上，聚精会神地交谈。be absorbed in为固定搭配，意为“专心于”，所以此处应用absorb的过去分词形式，作伴随状语。 答案 B 3．—Pity you missed the lecture on nuclear pollution. —I ______ it，but I was busy preparing for a job interview. A．attended B．had attended C．would attend D．would have attended 解析 考查虚拟语气。句意：——很可惜你错过了这次有关核污染的演讲。——我本来要参加，但忙于准备工作面试。根据but后面的内容可知，设空处表达与过去事实相反的虚拟语气，所以正确答案为D项。 | 
