The football match had to be stopped. They ______ (play) for half an hour when there was a terrible storm.

【参考答案】

had been playing考点是时态。当暴风雨来的时候足球比赛已进行了半小时“for half an hour”，......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)