By the time I got to the cinema ,the movie ____for 15 minutes.

问题描述:

By the time I got to the cinema ,the movie ____for 15 minutes.
A.had started B.started C.had been on D.was on
答案为什么是C,而不是A?

15 minutes表示一段时间,应与延续性动词连用.
By the time +表过去的时间或句子,后接过去完成时,