When____, the buildings will be used as a school for children from flood areas.
A. completed B. completing C. to be completed D. is completed
When____, the buildings will be used as a school for children from flood areas.
A. completed B. completing C. to be completed D. is completed
A 本题考查省略。原句为：when(they are) completed. 当主从句主语一致时，或从句主语为it，且从句中含有be 动词，则可以省略从句中的主语及be动词，构成主从句省略。