The manager required that the work----before Friday.

The manager required that the work____before Friday.
A.should finish B.would be finished C.be finished D.was to be finished
选项是C.
因为required是属于请求、命令的动词,这类动词后面的宾语从句需要用should加动词原形,或者省略情态动词should.又因为work是要被完成,所以,C选项就是省略了should的被动形式.