题目内容
3．The boy is often heard in the music room．He sings very well．（ ）| A． | practice singing | B． | to practice singing | ||
| C． | practiced singing | D． | to practice sing |
分析 这个男孩经常被听到在音乐室练习唱歌，他唱得很好．
解答 正确答案：B．根据题干可知这个男孩经常被听到在音乐室练习唱歌，其中practice singing表示练习唱歌，其在句中作主语the boy的补语，其次本句是一般现在时的被动语态（主语+is/am/are+done），在被动语态中补语practice singing的不定式to不能省略，故选择B．
点评 本题考查动词不定式，掌握被动语态的用法，根据句子成分及题干进行选择．
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