Excuse me could you tell me ?- Sorry sir I wasn’t there at that time.how did the

问题补充：

--- Excuse me, could you tell me ?

--- Sorry, sir, I wasn’t there at that time.

how did the accident happen B. how the accident happened

C. how does the accident happen D. how the accident happens

答案：

解析：宾语从句，需用陈述语序，排除A、C，看语境可知，发生在过去，用过去时态，选择B。