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At about nine o'clock they b___ to plant trees the day before yesterday.要填什么呢?

分类: 作业答案 • 2021-12-20 02:18:38

问题描述：

At about nine o'clock they b___ to plant trees the day before yesterday.要填什么呢?

答

应该是：
began 开始
前天大约九点时他们开始植树的