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

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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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