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

試題分析：句意：湄公河委員會發(fā)現(xiàn)沒有證據(jù)表明上游的水壩對下游的水流量有影響。evidence后接的是同位語從句，that在句子中不做成分也沒有意思，只對evidence進行解釋說明。
點評：名詞性從句是高考必考點，名詞性從句分為主語、賓語、表語、同位語從句四種，除賓語從句外，同位語從句和定語從句的區(qū)別是高考�？键c。同位語從句和定語從句的區(qū)別在于：that作為關(guān)系代詞，可以引導(dǎo)定語從句，充當句子成分，在從句中作賓語時可以省略； that引導(dǎo)同位語從句時，起連詞的作用，沒有實際意義，不充當句子成分，一般不能省略。
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