[题目]The patients were over a period of several months. 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】The patients were (观察)over a period of several months.

【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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