______ 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
【正确答案】
B
【答案解析】
主句的主语是the output，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when the output is compared with last year。答案为B。
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