题目内容
9．The old couple happily at their home when I walked past yesterday afternoon．（ ）| A． | heard singing | B． | heard to sing | ||
| C． | were heard singing | D． | was heard to sing |
分析 昨天下午当我经过的时候，这对老夫妇被听见在他们的家里快乐的唱歌．
解答 答案：C．根据题干可知，主语The old couple 是动作hear的承受者，和动词构成被动的关系，应该用被动语态，表示"被听见唱歌"．被动语态的结构是"be+过去分词"；根据句意可知，老夫妇是被听到正在唱歌，应用hear sb doing，其被动结构是be heard doing．根据句中 yesterday afternoon可知，应该用一般过去时．一般过去时态的被动语态的构成：was/were+及物动词的过去分词；又根据couple"夫妇"表示两个人，应用were．故选C．
点评 主要考查被动语态，当句子的主语是动作的承受者时，应该用被动语态，本题考查的是一般现在时态的被动语态．一定要注意：一般过去时态的被动语态的构成：was/were+及物动词的过去分词，以及动词过去分词的形式．
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