Thanks to the application of new farming methods,output is now six times          _____it was  before 2000.?
A．thatB．whatC．whichD．how?
B    
  考查固定句型。“倍數(shù)+what從句”是表示倍數(shù)的固定句型。句意為：由于新的農(nóng)業(yè)耕種方法的應(yīng)用，現(xiàn)在的產(chǎn)量是2000年前的六倍。
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