题目内容

An awful accident ________， however, occur the other day.
A．doesB．did
C．has toD．had to
B
此题正确答案应选B，句末的 the other day 意为“前几天”，所以句子应用过去时态，而选项D填进去不合题意。此句有两个难点：一是句中插有 however 一词，分散了同学们的注意力；二是所填选项B为许多同学所不熟悉的强调用法。
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