题目内容
18.The world's population has grown by six times ______ it was in 1800.( )A. | that | B. | when | C. | which | D. | what |
分析 世界的人口已经上涨到1800年的6倍.
解答 答案是D.本题考查名词性从句的引导词;从句中缺少的表语,what引导名词性从句在从句中做主语、宾语或表语,故答案选D.that在名词性从句中不担任成分,无意义,故排除;when在句中不能做表语,故排除;C项which表示选择,本题无选择的含义,故排除.
点评 名词性从句考查的关键是连接词的选用和语序,因此,我们首先要搞清从句的性质,掌握各连接词的用法,在此基础上判断.
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