Question

It is reported in the papers that the old coins _______under the earth for about 200 years by the time they were discovered

1. A.
   had buried
2. B.
   had been buried
3. C.
   buried
4. D.
   were buried

Answer 1

B
本题考察时态。由by the time引导的从句中谓语were discovered知应主句用过去完成时，by引导的时间状语或从句时，主句一般用完成时。