题干
— ________ have you been in Dali?
— For about three years.
A：How long
B：How soon
C：How often
D：When
答案(点此获取答案解析）
A
— ________ have you been in Dali?
— For about three years.
A：How long
B：How soon
C：How often
D：When
的定义域为R，则k的取值范围是（ ）