This year the steel output of our plant has increased by three times as compared with_____

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This year the steel output of our plant has increased by three times as compared with______last year, or in other words, this years output is three times more than that of last year.

A.what of

B.those of

C.that of

D./

请帮忙给出正确答案和分析,谢谢!

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