Thanks to the economical development workers' wages have increased as far as 200% in the

问题补充：

Thanks to the economical development, workers wages have increased as far as 200% in the recent three years.

A. for

B. to

C. up

D. by

答案：

A. for

B. to

C. up

(答案→)D. by

解析：考查介词的用法。increase by “净增了,以…比率增长”,类似的表达 grow by, rise by等...，而如果是“增加到”则用increase to ,grow to, rise to.句意：多亏了经济的发展，工人的工资在近三年已经增长了高达200%。