问题
选择题
Listen! Can you hear them _______ in the next room?
A．practising to sing
B．practising singing
C．practise singing
D．to practise sing
答案
答案：B
题目分析：句意：听！你能听到他们在隔壁的教室练习唱歌吗？hear sb doing sth听见某人正在做某事；practise后面接动名词形式，故选择B。
