问题
选择题
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
答案
答案：B
grain是不可数名词。倍数放在最前面。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。