Oil prices have risen________32 percent since last year，________a record $84.65 a barrel on Nov.9.
A．by；reached B．by；reaching C．by；to reach D．to；reaching
B
【解析】
試題分析：考察介詞和分詞做狀語。第一空中的介詞by表示程度，rise by 32 percent上升了百分之32；介詞to表示程度；第二空的現在分詞doing與句子主語oil price構成主動關系，在句中做結果狀語，表示的是意料之中的結果。句意：自從去年以來，油價上升了百分之32，在11月9日達到了$84.65 a barrel。故B正確。
考點：考察分詞做狀語
點評：當分詞做狀語的時候，如果構成分詞的動詞與句子的主語構成主動關系，就使用現在分詞做狀語；當二者構成被動關系，使用過去分詞做狀語。如果分詞的動作發生在謂語動詞之前，就使用分詞的完成式。如果分詞與句子的主語沒有關系，可以使用狀語從句或者獨立主格結構。
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