The old couple were seen (take) ______ a walk in the park everyday after supper.

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问题 The old couple were seen (take) ______ a walk in the park everyday after supper.

选项

答案to take

解析 在主动语态中,短语see sb.do sth.为省to不定式作宾语补足语,但在被动语态中 省略的to必须还原,连接前后两个动词,所以填入动词不定式to take。
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