—How is the debate of your essay?—It well, but I one of the key points.A. might work; had

—How is the debate of your essay?
—It well, but I one of the key points.
A. might work; hadn’t forgot
B. needn’t have worked; forgot
C. could have worked; forgot
D. would work; hadn’t forgot

A. might work; hadn’t forgotB. needn’t have worked; forgot(答案→)C. could have worked; forgotD. would work; hadn’t forgot解析：考查情态动词的用法和时态：句意：--你的论文答辩怎样？--它本来可以进行地很好，但是我忘了其中的一个重点。对过去的情况的虚拟用情态动词+完成式，排除AD项，needn’t have worked表示过去没有必要做好，很显然不符合语境；这里指过去本能进行地很好，而没有，所以用could have worked，第二空forget的动作对于回答者来说答辩已经结束，忘记重要的内容也是发生在过去，所以应该用过去式，故选C。

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