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They have produced     they did last year.

A.twice more grain as        B.twice as much grain as

C.twice as many grain as       D.as twice many grain as

B


解析:

此题考查倍数表示法,不论哪种表示法,主语、谓语之后都应先加上倍数,所以首先排除D。若选A,more应与than搭配,所以此选项也可排除。grain是不可数名词,应用much修饰,所以排除C。

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