Marywenttotheboxofficeatlunchtime,butallthetickets

问题详情：

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

【回答】

B

知识点：过去完成时及其被动式

题型：选择题