题目内容
【题目】When I was walking past his room yesterday evening，I heard him _____ the piano.
A. play B. to play C. playing
【答案】C
【解析】句意“当我昨天晚上经过他的房间时，我听到他正在弹钢琴”。hear sb do听到全过程；hear sb doing听到某人正在所。根据句意，故选C。
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题目内容
【题目】When I was walking past his room yesterday evening，I heard him _____ the piano.
A. play B. to play C. playing
【答案】C
【解析】句意“当我昨天晚上经过他的房间时，我听到他正在弹钢琴”。hear sb do听到全过程；hear sb doing听到某人正在所。根据句意，故选C。