The manager demanded that the work within three days.A. was finishedB. had been finishedC.

问题补充：

The manager demanded that the work within three days.

A. was finished

B. had been finished

C. be finished

D. finished

答案：

A. was finished

B. had been finished

(答案→)C. be finished

D. finished

解析：动词demand后面宾语从句中的动词应该用should do，should可省略。故选C项。此类动词常见的有：insist; suggest, advise, propose, recommend, demand, command, require, desire, request, urge, order等。