题目

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 句意: 玛丽在午餐时间去了售票处, 但是所有的票都已经卖完了。根据题干信息Mary went to...为过去时间, 而票售完在此时间参照点之前, 即“过去的过去”。  
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