问题补充：
We were listening closely to the lecture yesterday evening when suddenly the light .
A. had been gone out
B. was going out
C. was gone out
D. went out
答案：
A. had been gone out
B. was going out
C. was gone out
(答案→)D. went out
解析：这题考查时态，句意是;昨天我们正在认真的听讲座，这时突然灯灭了。说明灯灭了是在听讲座时，属于过去时间。选D。
