An awful accident ________, however, occur the other day.

An awful accident ________, however, occur the other day. A.does B.did C.has to D.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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