Inour company,great changes _______ since the new manager came.
A. took place
B. have been taken place
C. was taken place
D. have taken place
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Last month I went to Germany and _______ (take) part in the world Skills competitions. (2013,12. B)
The company __________(employ) more than 50 IT engineers since last year. (2013, 6. B)
A water power station __________ (build) in this area several years ago.(2012,12 B)
Up till now, he ____________ (work) on the software design for 10 years. (2012,12 B)