Ling ling goes to the library twice a week 对 twice a week 提问
问题描述：
Ling ling goes to the library twice a week 对 twice a week 提问
答
How often does Ling Ling go to the library?
对频率提问用：how often 多久
不明白的再问哟,请及时采纳,多谢