If there’s a lot of work , I’m happy to just keep on until it is finished. A. to do B. t——青夏教育精英家教网——

19. If there’s a lot of work_______, I’m happy to just keep on until it is finished.

　 A. to do　　　　　 B. to be doing　　　　　 C. done　　　　　　 D. doing

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