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

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

At about nine o'clock they b___ to plant trees the day before yesterday.要填什么呢?
应该是:
began 开始
前天大约九点时他们开始植树的