While ___ along the street, I met an old...

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

A．I walking

B．was walking

C．I am walking

D．walking

：Ｄ【解析】：考查状语从句的省略。当状语从句的主语和主句的主语一致的时候，可以把状语从句的主语和系动词一起省略。本题省略了Ｉwas.句意：当我在街道上走的时候，我遇见了一个老朋友。故D正确。

考点分析：

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