---- Why does the river smell terrible?
---- Because large quantities of water______．
A．have been pollutedB．has pollutedC．has been pollutedD．have polluted
A              
             
試題分析： 考查動詞的時態(tài)與語態(tài)。句意 為什么這條河流的味道那么難聞？因為大量的水被污染掉了。Large quantities of +名詞 做主語是謂語動詞用復(fù)數(shù)形式，水與污染之間是被動關(guān)系，結(jié)合以上兩點，故選A項。         
考點 : 考查動詞的時態(tài)與語態(tài)
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