题目内容
20．Mary__________the song at a party．（ ）| A． | heard sing | B． | was heard singing | ||
| C． | was heard to sing | D． | was heard sing |
分析 在一个聚会上，Mary 被听见唱了这首歌．
解答 答案：C．
hear是"听见"的意思．"听见某人做某事"为"hear sb do sth"，这是主动形式，其被动形式为"sb be heard to do sth"意为"某人被听见做某事"．"在一个聚会上"说明事情发生完了，要用一般过去时，根据所给的选项，句意应该为"Mary被听见"，故要用一般过去式的被动语态，B和C 都是，但B选项强调的是过去的某个时间正在发生，而本句强调的是结果，故选C．
点评 本句既考察了时态，又考察了语态，一般过去时的被动语态的构成是"主语+were/was+及物动词的过去分词"．"hear sb do sth 听见某人做某事"的被动语态是"sb be heard to dosth某人被听见做某事"强调过程和结果，"hear sb doing sth听见某人正在做某事"的被动语态是"sb be heard doing sth某人被听见正在做某事"强调的是动作．
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