We are so sorry for that．We'll try to determine exactly went wrong that evening．
A. where
B. what
C. which
D. how
网友回答
A. where
(答案→)B. what
C. which
D. how
解析：考查宾语从句。本题中的宾语从句what went wrong that evening作为动词determine的宾语，what引导起这个宾语从句，并在句中做主语。AD项不能在句中做主语。C项是指特定范围之内的某一个。句意：对于那件事情我们都感觉很遗憾。我们将努力查清楚那天晚上发生了什么事情。故B正确。