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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.whichB.thatC.where   D.what

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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