Can you hear a girl in the room?Yes. let’s go to see her. A. singB. to singC. sin

问题补充：

--- Can you hear a girl in the room?

--- Yes. let’s go to see her.

A. sing

B. to sing

C. singing

D. to singing

答案：

A. sing

B. to sing

(答案→)C. singing

D. to singing

解析：hear sb do sth 听见某人做了某事; hear sb doing sth 听见某人在做某事，根据下文可以得知“唱”正在进行所以用C选项