When I came back into the house ,it _____(rain) harder and harder_英语解答

When I came back into the house ,it _____(rain) harder and harder.
这个空填was raining 为什么?

人气：460 ℃　时间：2019-08-23 07:33:53

解答

很多这样的句子的.
是在某事时,正在发生某事,由一过去式加一过去进行时组成.
例：I was watching TV when the telephone rang.电话铃响起时,我正在看电视.