问题
选择题
The doctors did all they the sick man back to life.
A．could bring
B．could to bring
C．could bringing
D．cuold to bringing
答案
答案：B
这句话的意思是“医生们做他们能够做的一切来挽救这个病人的生命”。do all they can(do)to do…可以理解为定语从句，其先行词是all，关系代词that被省掉。此外还可以表达为do everything(that)they can(do)to do…或do what they can(do)to do…。