题目内容

It began to rain ______ I was walking in the park.
A．until B．becauseC．whileD．although
C

试题分析：句意：当我正在公园散步期间天开始下雨了。分析：下雨的时间是我正在公园散步的时候，是一个延续性的动作，因此用while. 故选C
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