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

问题补充：

We finish it ahead of time, though it was such a tough task.

A. could B. would C. were able to C. ought to

答案：

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。

【标签】情态动词辨析