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【题目】While ___ along the street, I met an old friend of mine.

A. I walking

B. was walking

C. I am walking

D. walking

【答案】D

【解析】本题考查了省略。在时间状语从句、条件状语从句和让步状语从句中,如果主句的主语与从句的主语一致,谓语含有动词be,经常采用省略的形式,如He never speaks to anyone unless (he is ) spoken to. A, B句子结构错误;C时态错误。

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