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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．which      　　B．that         　　C．where   　　　 D．what

     

    【答案】

     B

    【解析】

    试题分析：句意：湄公河委员会发现没有证据表明，在上游水坝对下游的水流有影响。that 引导同位语从句，强调证据的内容，从句不缺成分。所以B对。

    考点: 考查同位语从句的用法。

     

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