We finish it ahead of time, though it was such a tough task.A. could B. would C. were abl

发布时间：2020-08-17 11:59:39

We      finish it ahead of time, though it was such a tough task.
A. could   B. would   C. were able to   C. ought to

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解析：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。
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