题目内容

--- 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
B
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。
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