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英语选择,求个标准答案

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英语选择,求个标准答案
21. ________ arriving at the meeting room, Tina discovered that she had left the sample products in her office.
A. By B. Through C. On D. In
 22. Not until yesterday ________ anything about the new advertising campaign.
  A. I learnedB. have I learned
C. did I learned D. that I learned
 23. Miss Smith’s assistant enjoys ________ for her although she treats him very strictly.
  A. workB. workingC. to workD. worked
 24. John had never been abroad before, ________ he found the business trip very exciting.
  A. because B. though C. so D. while
 25. Jack said the construction of the subway would be completed in October, ________ is a great surprise to us.
A. this B. what C. that D. which
c一.就
B not..until 打头要倒装
A enjoy doing
d 表尽管
D非限制性
再问: 2选B?C为什么不对?
再答: 直到昨天我才知道。。。不好意思,看错了,这里是选C,但如果有had i也可以选,表示过去的过去,