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50. A. is B. was C. were D. are___________THE END____________KEYSI-1.C 2.A 3.C 4.D 5.C 6.C 7.D 8.C 9.A 10.C 11.B 12.C 13.C 14.D 15.D 16.D 17.D 18.B 19.A 20.A 21.A