题目内容

One third of the people trapped in the ruins _______ at last.
A．has dug outB．was dug outC．have dug outD．were dug out
D
考察主谓一致。句意：陷入废墟中的三分之一的人最后被发现了。在有分数修饰的名词后，谓语与复数主语保持一致，本句中people表示复数人们的意思，人们是被发现的对象，故用被动语态，选D。
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