中科新闻网钢丝软轴传动原理:高中英语题 说下原因
来源：百度文库 编辑：中科新闻网 时间：2024/07/04 05:26:48
it happened ____(rain) when we went to the park
to rain.
happen to do sth. 碰巧做某事。
it happened ____(rain) when we went to the park.
it happened to be raining.碰巧正在下雨。
中科新闻网是一部内容开放、自由的互动网络百科全书
客观、专业、权威的知识性百科全书
来源：百度文库 编辑：中科新闻网 时间：2024/07/04 05:26:48
to rain.
happen to do sth. 碰巧做某事。
it happened ____(rain) when we went to the park.
it happened to be raining.碰巧正在下雨。