问题补充：
half an hour earlier, you would have met the famous writer.
A. If you came
B. Would you come
C. Had you come
D. Should you have come
答案：
A. If you came
B. Would you come
(答案→)C. Had you come
D. Should you have come
解析：
试题分词：考查虚拟语气中的省略。根据主句中的would have met说明这是一个与过去事实兴奋地虚拟语气，本句中使用过去完成时if you had come half an hour earlier.省略了if要使用部分倒装的形式。故C正确。
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