The sales _____ steadily, the factory needs an increasing supply of raw material.                                                   
A．have gone upB．a(chǎn)re going upC．gone upD．going up
D
考查獨立主格結(jié)構(gòu)。本題逗號前后沒有連詞，說明前半部分不是句子，而是一個短語，the sales與go up構(gòu)成主動關(guān)系，所以使用現(xiàn)在分詞和名詞構(gòu)成獨立主格結(jié)構(gòu)。The sales going up steadily="Because" the sales go up steadily.
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