Since the introduction of the new technique, the production cost______greatly．A、

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问题 Since the introduction of the new technique, the production cost______greatly．

选项 A、reduces
B、is reduced
C、is reducing
D、has been redused

答案 D

解析本题考查的是动词时态和语态的用法。由since引导从句或后跟名词，其主句用现在完成时态。此外，“cost”是“reduce”的宾语。因此应用reduce的现在完成时而且要用被动语态，故选D。

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