题目内容

I met a friend of mine _____ I was walking in the park.
A．beforeB．whenC．afterD．if
B
连词辨析。Before在……之前； after在……之后；if是否，如果。when当…的时候常用来引导时间状语从句。句意：当我正在公园散步时，我遇到我的一个朋友。结合语境可知选B。
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