问题
选择题
The sales _____ steadily, the factory needs an increasing supply of raw material.
A．have gone up
B．are going up
C．gone up
D．going up
答案
答案：D
考查独立主格结构。本题逗号前后没有连词，说明前半部分不是句子，而是一个短语，the sales与go up构成主动关系，所以使用现在分词和名词构成独立主格结构。The sales going up steadily="Because" the sales go up steadily.