Using Dr Yuang's hybrid rice, nowadays farmers are producing harvests ________ before.
A.as twice large as
B.twice as much as
C.twice as large as
D.as twice much as
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B解析试题分析：考查倍数表达法。倍数表达法：倍数 as 形容词的原级 as…；本题的twice就是倍数；形容词原级much修饰不可数名词，放在as…as…之中；句意：使用袁隆平的杂交水稻，现在农民的产量是以前的两倍。故B正确。考点：考查倍数表达法点评：倍数表达法：倍数 as 形容词的原级 as…；本题的twice就是倍数；形容词原级much修饰不可数名词，放在as…as…之中；