50. The regents discussed the various candidates at length.

A from time to time B in detail C in line D one by one

参考答案：

1. B 2. D 3. B 4. D 5. A 6. D 7. A 8. C 9.D 10. A

11.C 12.D 13.C 14.D 15.C 16.D 17.B 18.C 19.B 20.C

21.A 22.B 23.A 24.B 25.A 26.D 27.D 28.D 29.C 30.C

31.D 32.A 33.B 34.B 35.B 36.D 37.A 38.B 39.A 40.C

41.D 42.C 43.B 44.D 45.B 46.D 47.B 48. D 49.C 50B

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