Listen! Can you hear them in the next room?A. practising to singB. practising singingC. p

问题补充：

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：

A. practising to sing

(答案→)B. practising singing

C. practise singing

D. to practise sing

解析：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。