问题补充：
—How was your day off yesterday?
—Perfect！It was my grandmas birthday. We had a big cake.
A .eighty B. eightieth C. the eightieth
答案：
解析：句意：--昨天，你的假期过得如何？--完美！昨天是我奶奶的八十大寿。我们吃了一个大蛋糕。考查数词的用法，表示某人多少个生日用序数词形式，在第八十前已经有了限定词my grandma’s, 因此不用定冠词the.故选 B
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