It is said that the old coins ______ under the earth for about 100years by the time they were discovered.
A．had buriedB．had been buriedC．buriedD．were buried
B
考查時(shí)態(tài)。by the time+過去的時(shí)間，主句用過去完成時(shí)態(tài)，根據(jù)by the time they were discovered.，應(yīng)選B。句意：據(jù)說這些古老的硬幣被發(fā)現(xiàn)的時(shí)候，已經(jīng)被埋在地下100年了。
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