题目内容
A terrible accident _______,however, occur the other day and we witnessed it _______ accident.
A. does; by B. did; by C. has to; on D. had to; on
B
解析:前面句子表示强调,出现时间状语the other day用一般过去时而不是一般现在时;by accident表示“碰巧,偶然”。
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