[单选题,2分] Some 40 percent of the hired hands left before they（）their term of service. A.finish B.finished C.would finish D.have finished

[单选题,2分] Some 40 percent of the hired hands left before they（）their term of service.
A.finish
B.finished
C.would finish
D.have finished

出自：安阳师范学院—大学英语

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