一道英语题高中的：It is said that the old coins __ under theearth for about 100 year by the timethey were discoveredA.had buried B.had been buried C,buried D.were buried
问题描述：
一道英语题高中的：It is said that the old coins __ under theearth for about 100 year by the time
they were discovered
A.had buried B.had been buried C,buried D.were buried
答
选B。一般情况下for about 100 years表示一段时间，一般要接完成时。
答
B
过去完成时
答
B.had been buried
发现的时间是过去,此处要用完成时,因此过去完成时,被埋藏,所以Bhad been buried
据说那枚古币在被发现之前就已经被埋在地下大约有一百年了.
答
选B
用被动语态，排除A
根据by可知，用完成时态，排除CD
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