问题
选择题
Mary is often heard ________ playing piano in the next room in the evening.
A．practise
B．to practise
C．practising
D．practiced
答案
答案：B
本题考查动词用法。hear sb do sth听说某人做某事，其被动语态中要加上to，故选B。句意：常听说Mary晚上在隔壁房间弹钢琴。
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