I stood there patiently until he his work.A. has finishedB. would finishC. had finishedD.

网友回答

A. has finished
B. would finish
(答案→)C. had finished
D. finishes
解析：考查时态，句意：我耐心的站在那儿知道他完成了他的作业。结合语境可知从句动作为过去已经完成的动作，故用过去完成时态。选C。