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What is concerning us greatly is ____ the workers held up in that area yesterday will be set free.

A．that B．what C．when D．which

C

解析試題分析:考查名詞性從句。從結(jié)構(gòu)可知此處是表語從句，從句中不缺成分，但是意思不完整，由此可知要用連接副詞，所以C選項正確。句意：讓我們非常擔憂的是昨天在那個地區(qū)被攔截的工人們什么時候被釋放。
考點：考查名詞性從句。

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