单选题 As soon as we got to the river bank, we ______ three groups and got down to planting trees.

【正确答案】 C
【答案解析】[考点] 近义词组
[解析] divide into“分成”,侧重分组;separate from“分离,分开”,侧重距离的分隔。这两个词均为及物动词,句中需要用被动语态。