the slaves ______ a century ago,but the black people are still not given their full human rights.
问题描述：
the slaves ______ a century ago,but the black people are still not given their full human rights.
A.set free
B.was set free
C.were liberated
D.are given freedom
为什么错了?
答
D的时态不对
a century ago 是个过去时间状语,要和一般过去时连用,而D 是一般现在时
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