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。