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We _____ finish it ahead of time, though it was such a tough task.
A. could   B. would   C. were able to   C. ought to
C
句意“虽然这是一项十分艰巨的任务,我们还是提前完成了”,表示经过特殊的努力而完成的努力,应用be able to;could 只表示一般性能力。
【标签】情态动词辨析
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