2016年12月真题34. Last year the employees in our department were so busy they were not able to take a vacation.
A. which
B. what
C. who
D. that
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2017年6月真题25. It was not until yesterday ________they decided to re-open the business talk.
A. when
B. which
C. that
D. as
2017年12月真题26. We took advantage of its sports facilities _____ staying at the hotel.
A. although
B. while
C. until
D. unless
2017年12月真题29. If you _____ your mind, please call me at this number before Saturday.
A. changed
B. would change
C. had changed
D. change
2017年12月真题33. ______ you are a first time buyer or not, we will offer you a good price today.
A. Whatever
B. Whenever
C. Whether
D. However