It is said that the old coins ______ under the earth for about 100years by the time they were discov

题目简介

It is said that the old coins ______ under the earth for about 100years by the time they were discovered.

A．had buried

B．had been buried

C．buried

D．were buried

题型：单选题难度：中档来源：不详

考查时态。by the time+过去的时间，主句用过去完成时态，根据by the time they were discovered.，应选B。句意：据说这些古老的硬币被发现的时候，已经被埋在地下100年了。