Mary went to the box office at lunch time, but all the tickets out.
A. would sell
B. had been sold
C. have been sold
D. was selling
网友回答
A. would sell
(答案→)B. had been sold
C. have been sold
D. was selling
解析：考查时态。句意：Mary在吃午饭的时候去了售票处，但是所有的票都被卖完了。根据句意说明所有的票被卖完是在她去办公室之前，而她去办公室使用了一般过去时，那么票买完使用过去完成时。根据句意还要使用被动语态。故B正确。