【题目】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
在线课程【答案】B
【解析】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。