1 often hear her .this song. Listen! Cant you hear her in the next room?. A. sing; sing B

问题补充：

1 often hear her .this song. Listen! Can you hear her in the next room?.

A. sing; sing B. singing; singing C. sing; singing

答案：

解析：考查非谓语动词。 Hear sb do sth.听见某人做某事；hear sb doing sth听见某人正在做某事。