—Listen! I heard the birds around us. —Yeah, what beautiful music!A. sangB. singC. to sin

发布时间：2020-08-16 18:27:31

—Listen! I heard the birds      around us.
—Yeah, what beautiful music!
A. sang
B. sing
C. to sing
D. singing

网友回答

A. sang
B. sing
C. to sing
(答案→)D. singing
解析： 略
以上问题属网友观点，不代表本站立场，仅供参考！