【题目】The patients were (观察)over a period of several months.
在线课程【答案】observed
【解析】这个病人被观察了好几个月，观察在此表被动，be done。故填observed。
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The patients were over a period of several months.
编辑：chaxungu时间：2026-04-27 03:08:39分类：高中英语题库
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