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.
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
.A.had been trapped B trapped
C had trapped Dwere trapping
.A.had been trapped B trapped
C had trapped Dwere trapping
英语人气：530 ℃时间：2019-12-07 09:19:36
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