We were glad to know that all the wokers who ——— in the mine were saved.A.had been trapped B trappedC had trapped Dwere trapping
问题描述：
We were glad to know that all the wokers who ——— in the mine were saved
.A.had been trapped B trapped
C had trapped Dwere trapping
答
以为句子中的时态是过去时，所以证明这件事已经发生过，所以选A
答
A.had been trapped
答
who引导的是一个定语从句,是一个句子,自然后面要包含所有句子成分.
一个句子只能说They had been trapped in the mine.
总不能说They trapped in the mine.它根本不是完整句子.被动语态没有be了.
答
选A 句意：我们很高兴知道所有被困在矿井中的工人得救了。所以选A，用被动语态表示被困的工人
这道题考得是动词的语态。B是一般过去时，C是过去完成时，D是过去进行时 。这三项都是主动语态，A是过去完成时+被动语态。