题目内容
3．The couple _______ a walk outside at this time yesterday．Nobody knows when they went back．（ ）| A． | were seen taking | B． | was seen taking | ||
| C． | were seen to take | D． | was seen took |
分析 昨天这个时候有人看见这对夫妇正在外面散步．没人知道他们什么时候回来的．
解答 答案：A．
结合时间状语at this time yesterday表达的是过去的事情用一般过去时，see sb doing sth看见某人正在做某事，主语the couple是see的承受者，故用一般过去时的被动语态was/were+过去分词，主语复数，故were，see的过去分词seen，故答案是A．
点评 被动语态由"助动词be+及物动词的过去分词"构成．被动语态的时态变化只改变be的形式，过去分词部分不变．疑问式和否定式的变化也如此．
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