- How often do you visit your grandparents Tom ? A. Half an hour.B. Three hours.C. Twi

问题补充：

- How often do you visit your grandparents, Tom ?

--

A. Half an hour.

B. Three hours.

C. Twice.

D. Hardly ever.

答案：

A. Half an hour.

B. Three hours.

C. Twice.

(答案→)D. Hardly ever.

解析：how often意思是多久以后，表示频率，常用频率副词来回答，比如often，never，hardly，once a week等。