We were glad to know that all the wokers who ——— in the mine were saved

We were glad to know that all the wokers who ——— in the mine were saved

题目
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
答案
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.
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