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
did 因为是几天前用did表强调
答
选did, 因为句子已经有动词occur，这里did是强调，“的确”的意思
译文：“但是，那天的确发生了严重的事故。”
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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答
An awful accident（），however，occur the other day。 1 did 2 does 3 has to 4 had to
选1
中间的however可以不看
主干就是【An awful accident occurred the other day】
did作为助动词气的是强调作用
有不会的可以再问我