He read my credit card number out loud in front of customers __________I could stop him.(2019年12月第28题)
A. before
B. while
C. as
D. since
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You will not be able to improve your work_____________ you are aware of your shortcomings.(2019年6月第22题)
A. if
B. unless
C. when
D. since
_______________we are living in the big data era, we are able to collect and analyze as much patient in - formation as possible. (2019年6月第29题)
A. Even though
B. As if
C. In that
D. Now that
Ithas been quite some time since we_________________you at your office in Beljing(2019年6月第30题)
A. visit
B. visited
C. havevisited
D. hadvisited
Companies understandably ask: why should I train you _________________ you ' ll leave and work for my competitors?(2018年12月第21题)
A. if
B. unless
C. until
D. although