as soon as 后面加possible是因为原形是as soon as it is possible ,将it is省略后,自然酒保留了possible,英语中,有许多省略it is的情况,例如:
We will get back to you as soon as possible. 我们将尽快再跟你联系(摘自《柯林斯英汉双解大词典》)
If (it is) necessary I can come at once.如果必要,我可以马上来(摘自《牛津词典》)(本句中 if necessary,中间的it is可以省略)


