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他们正要下山,这时天突然开始下起了大雨(begin)Theywereabouttogetdownthehillwhenitbegantorain为什么不是Theywereabouttogetdownthehillwhenitwasbeginningtorain求助

题目详情
他们正要下山,这时天突然开始下起了大雨(begin)
They were about to get down the hill when it began to rain
为什么不是
They were about to get down the hill when it was beginning to rain
求助
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