Tom got sick last May and has been in bed since then.为什么has

Tom got sick last May and has been in bed since then.为什么has John got sick last january and in bed since then.中填什么? The old man got sick last April and __in bed since then.A wa he has been in english since last he has been in english since last 什么意思 My brother has been in Africa since last year. Tom has been collecting stamps since My uncle got sick last month and _______ in hospital since t Since I got over it,my life has been filled with p___ and I' Since then,it_______every 4 years.为什么填is held而不是has been hel Lucy has been working ________ since she got ________ A in t Perhaps she has been in place then?