问题
选择题
I think the MP3 is very helpful. It ______for listening to music. [ ]
A. is used
B. uses
C. was used
D. used
答案
答案：A
搜题请搜索小程序“爱下问搜题”
I think the MP3 is very helpful. It ______for listening to music. [ ]
A. is used
B. uses
C. was used
D. used
答案：A