It was 80 years before Christopher Columbus crossed the Atlantic Zheng He had sailed to East Africa....
2022-05-13 22:56:06 217次 黑龙江哈尔滨市2019-2020学年高二下学期阶段验收英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It was 80 years before Christopher Columbus crossed the Atlantic Zheng He had sailed to East Africa.
A.when B.that
C.after D.since
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