题目内容
44. 他们正在地里干活，突然下起了 。 (be doing… when)
44. They were working in the fields when it began to rain.
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智趣寒假作业云南科技出版社系列答案题目内容
44. 他们正在地里干活，突然下起了 。 (be doing… when)
44. They were working in the fields when it began to rain.
智趣寒假作业云南科技出版社系列答案