问题
选择题
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
答案
答案：C
考查表语从句。根据句意可知应该是何时。句意：最让我担心的事情是在那个地区被绑架的工人何时被释放。
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