题目内容
14.Even if there is no scientific proof yet ______ secondhand smoke causes cancer,there is no reason why nonsmokers should be forced to take this risk.( )A. | which | B. | that | C. | when | D. | where |
分析 即使没有科学证明二手烟能致癌,但也没有理由非吸烟者要去冒这个险.
解答 答案B.
分析句子结构可知,逗号之前是由"even if"引导的让步状语从句,逗号之后是主句;状语从句中又有一个由连接词"that"引导的同位语从句解释说明名词"proof"的具体内容,"that"在从句中不作成分,只起连接作用,因此B项正确,故选B.
点评 本题考查同位语从句.
同位语从句是意义完整地陈述句时,用连词that引导,that在从句中不充当任何成分,只起连接词作用,通常不省略;引导定语从句的that在句中充当一定的成分,并且作宾语时可以省略.
如:We are glad at the news that he will come soon.(同位语从句)
The news that he told me was really surprising.( 定语从句)
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