.He walked down the hills, softly to himself.A. sing  B. singing  C. sung  D. to sing

发布时间:2020-08-16 12:27:19


.He walked down the hills,      softly to himself.
A. sing  
B. singing  
C. sung  
D. to sing

网友回答

A. sing  
(答案→)B. singing  
C. sung  
D. to sing
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