问题
选择题
Has all that ____ without delay ____ yet?
A．can do…being done
B．done…been done
C．ought to be done…to do
D．should be done…been done
答案
答案：D
选D。that should be done without delay是定语从句。其中that在从句中作主语。而将本句还原后主句为All has been done。