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
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D解析考查独立主格结构。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.