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[[求助与讨论]] What it functions as?

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发表于 2007-11-25 22:20:19 | 显示全部楼层 |阅读模式
Oil prices have risen by 32 percent since the start of the year, ______ a record US $57.65 a barrel on April 4.
A. have reached    B. reaching  
C. to reach      D. to be reaching

“B” is sure the key to this exercise. However, what does “reaching a record US $57.65 a barrel on April 4” function as? Please teach me in detail. I really can’t get it!
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