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19.He said _______ he would come back in a week.
A. when B. what C. that D. why
【答案】C。解析:考查宾语从句。when什么时候;what 什么;that那个,引导宾语从句只起引导作用,无意义;why为什么。句意:他说他会在一周后回来.结合语境可知本句宾语从句中不缺少句子成分,因此C为正确答案。
20.________ she couldn’t understand was ________ fewer and fewer students showed interest in her lessons.
A.What; why B. That; what C. What; because D. Why; hat
【答案】A。解析:考查主语从句和表语从句,分析句子结构“________ she couldn’t understand”是一个主语从句,从句中缺少understand的宾语,所以用what引导,what做从句的宾语,fewer and fewer students showed interest in her lessons是一个表语从句,根据句意:她不能理解的是为什么越来越少的学生对她的课表现出兴趣,所以用why来引导,故A为正确答案。
21.There is no doubt ________ Catherine is fond of dancing, for she always practices it on weekends.
A. whether B. if C. that D. which
【答案】C。解析:考查同位语从句,句意:毫无疑问Catherine喜欢跳舞,因为她总是在周末练舞。分析句子的结构可知,逗号之后为“for”引导的原因状语从句,逗号之前是主句,主句中结构为"There is no doubt that..."意为"毫无疑问……",连词"that"引导同位语从句解释说明名词"doubt"的具体内容,同位语从句中句子结构和意思已完整,"that"无意义也不充当成分,只起连接词的作用.故C为正确答案。