Listen! Someone songs.A. are singingB. singingC. singD. is singing

问题补充：

Listen! Someone songs.

A. are singing

B. singing

C. sing

D. is singing

答案：

A. are singing

B. singing

C. sing

(答案→)D. is singing

解析：listen，是现在进行时的标志词。Someone作主语一般看作单数。