We _______ finish it ahead of time, though it was such a tough task.
A．couldB．wouldC．were able toD．ought to
C
考查情態(tài)動詞。could 能夠，would 會，were able to 成功做成什么事，ought to 應(yīng)該，句意：我們成功的提前完成了任務(wù)，雖然這是一個如此艱難的任務(wù)。所以選C。
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