Mark Twain worked for several years as a pilot on a steamboat, taking passengers up and
down the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
A．a(chǎn)sB．whatC．whichD．who
C

試題分析：考查定語從句。Which指代先行詞river在定語從句中做主語；故C正確。
點評：定語從句的關(guān)鍵在于分析句子成分，如果句子很完整就使用冠詞副詞；如果句子中缺少主語，賓語，表語或者定語則使用關(guān)系代詞。
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