问题
_______ — “My father will be back in half an hour.” [ ]
A: How long will your father be back?
B: How often will your father be back?
C: How soon will your father be back?
D: How far will your father be back?
B: How often will your father be back?
C: How soon will your father be back?
D: How far will your father be back?
正确答案是：
