______ with last year the output of the factory this year has increased by twenty percent
已帮助 人
______ with last year, the output of the factory this year has increased by twenty percent.
A．Comparing
B．Compared
C．Having compared
D．To compare
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
主句的主语是theoutput，与compare之间存在被动关系，因此要用过去分词作状语，相当于一个状语从句whentheoutputiscomparedwithlastyear，答案为B。