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The Mekong River Commission has found no evidence               the dams on the upper reaches have an influence on the water flow downstream.


  1. A.
    that
  2. B.
    which
  3. C.
    where
  4. D.
    what
A
试题分析:句意:湄公河委员会发现没有证据表明上游的水坝对下游的水流量有影响。evidence后接的是同位语从句,that在句子中不做成分也没有意思,只对evidence进行解释说明。
考点:名词性从句
点评:名词性从句是高考必考点,名词性从句分为主语、宾语、表语、同位语从句四种,除宾语从句外,同位语从句和定语从句的区别是高考常考点。同位语从句和定语从句的区别在于:that作为关系代词,可以引导定语从句,充当句子成分,在从句中作宾语时可以省略; that引导同位语从句时,起连词的作用,没有实际意义,不充当句子成分,一般不能省略。
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