-It is demanded that the letter by the end of this week dad !----I’ll do it immediat

问题补充：

---- It is demanded that the letter by the end of this week , dad !

----I’ll do it immediately .

A. should mail

B. was mailed

C. mailed

D. be mailed

答案：

A. should mail

B. was mailed

C. mailed

(答案→)D. be mailed

解析：考查虚拟语气。在demand后从句中要求用should +动词原形表示虚拟语气，should可以省略，故选D。