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

解析試題分析：句意：湄公河委員會發(fā)現(xiàn)沒有證據(jù)表明，在上游水壩對下游的水流有影響。that 引導(dǎo)同位語從句，強調(diào)證據(jù)的內(nèi)容，從句不缺成分。所以B對。
考點: 考查同位語從句的用法。

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