Did your father tell you ________?

A．when he travelled to Hong Kong

B．how he goes to Shanghai

C．where he has spent his holidays

D．why did he visit Hangzhou

变态反应性接触性皮炎从初次接触致敏物到T细胞活化、增殖播散全身需（）天，而再次接触相同致敏物到炎症反应形成则只需（）小时。