Question

 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

Answer 1

D

解析:

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。