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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.
A.thatB.whichC.whereD.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。
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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