While ___ along the street, I met an old friend of mine.
A．I walking B．was walkingC．I am walking D．walking
：Ｄ
：考查狀語從句的省略。當狀語從句的主語和主句的主語一致的時候，可以把狀語從句的主語和系動詞一起省略。本題省略了Ｉwas.句意：當我在街道上走的時候，我遇見了一個老朋友。故D正確。
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