1.Since the beginning of 2013, these regulations _____ in most workplaces across the country. (2016-12)
A. will be introduced
B. have been introduced
C. are introduced
D. were introduced
The traffic was making so much noise that I couldn’t hear what he______. (2017-06)
A. is saying
B. was saying
C. has said
D. will say
I am interested in the training course, which__________at Hilton Hotel in Beijing from March 8 to 12, 2018. (2017-12)
A. held
B. was held
C. will hold
D. will be held
After the bargaining progress _____, a final agreement was signed. (2018-12)
A. is completed
B. had been completed
C. has completed
D. had completed