问题
选择题
Mary went to the box office at lunch time, but all the tickets ____ out. [ ]
A. would sell
B. had sold
C. have sold
D. was selling
答案
答案：B
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Mary went to the box office at lunch time, but all the tickets ____ out. [ ]
A. would sell
B. had sold
C. have sold
D. was selling
答案：B