Since the beginning of last year, these regulations _____ in most workplaces across the city. A be introduced B will be introduced C have introduced D have been introduce

Since the beginning of last year, these regulations _____ in most workplaces across the city.

A
be introduced

B
will be introduced

C
have introduced

D
have been introduce

出自：江苏开放大学大学英语（B）（1）作业3

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