______ with last year, the output of the factory this year has increased by twen

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问题 ______ with last year, the output of the factory this year has increased by twenty percent.

选项 A、Comparing
B、Compared
C、Having compared
D、To compare

答案 B

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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