—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
网友回答
A. might work; hadn’t forgot
B. needn’t have worked; forgot
(答案→)C. could have worked; forgot
D. would work; hadn’t forgot
解析：句意：--你的论文答辩怎样？--它本来进行地很好，但是我忘了其中的一个重点。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，所以用could have worked，多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。