By the time we rushed to the hall the party for ten minutes.A. had begunB. beganC. was o

问题补充：

By the time we rushed to the hall, the party for ten minutes.

A. had begun

B. began

C. was on

D. had been on.

答案：

A. had begun

B. began

C. was on

(答案→)D. had been on.

解析：句意：到我们冲进大厅的时候，这个聚会已经开始十分钟了。结合语境可知本句描述的是过去某时已经开始的动作，故用过去完成时态，选项A表示瞬间动作，不能和表示一段时间的时间状语连用，结合下文时间状语for ten minutes，可知选D。