答案是D
翻译：雨是什么时候开始下的?大概一个小时以前.
解析：后面说了“an hour ago",这是一个非常明确的时间点,所以整句话是过去式
若用进行时,就是表明start这个过程一直在进行.但是常识告诉我们start to rain只是几秒钟 的事情.
When___the rain__?About an hour ago.
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