if he ------.he------that food

if he ------.he------that food
lucky he was sent to the hospitai immediately .A.was warned ;would not take B.had been warned; c;would not have taken Dwould have been warned ;had not taken 下面的回答有个 immediately 马上的意思,表示现在用过去式吗 可答案是选B 求你讲得详细点
B应该是had been warend ;would not have taken