An awful accident（）,however,occur the other day.1 did 2 does 3 has to 4 had to 选哪个,为什么
问题描述：
An awful accident（）,however,occur the other day.1 did 2 does 3 has to 4 had to 选哪个,为什么
答
选B,理由：did表强调
然而,几天前确实发生了一场可怕的事故.
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