It is said that the old coins under the earth for about 100 years by the time they were discovered.
A. had buried
B. had been buried
C. buried
D. were buried
网友回答
A. had buried
(答案→)B. had been buried
C. buried
D. were buried
解析：
这题考查动词的时态语态：金币是被埋葬，所以是被动式，而且时间是be+过去时间，所以用过去完成时的被动。选B。