—Oh you have a headache and a coughhave you been like this?— Two days.A. How longB. Ho

问题补充：

—Oh, you have a headache and a cough. have you been like this?

— Two days.

A. How long

B. How often

C. How old

D. How many

答案：

(答案→)A. How long

B. How often

C. How old

D. How many

解析：how long用来提问“多长时间”，对“一段时间的长短”提问时用，；how often用来提问某动作或状态发生的频率，对“一段时间内发生了几次活动”（always，usually， often， never或twice a day等表示频度的词或短语）提问时用。根据答语Two days知，上句问的应该是像这样的感冒有多长时间、多久了，故选A。