题目内容
【题目】The boy is often heard _____in the music room. He sings very well.
A.practice singing B.to practice singing C.practiced singing
【答案】B
【解析】
试题分析:考查被动语态的中的非谓语动词用法。在主动句中:hear sb do sth;听见某人做过某事。
在被动句中:sb be heard to do sth:某人被听见做过某事。故选B
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