Since the introduction of the new technique, the production cost ______ greatly.

游客2023-10-04 25

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

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Sincetheintroductionofthenewtechnique,theproductioncost______greatly.