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 reduced

答案 D

解析本题测试的是动词时态和语态的用法。由since引导从句或后跟名词，其主句要用现在完成时态。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。

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