It was 80 years before Christopher Columbus crossed the Atlantic 　　　　 Zheng H

题干

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

上一题下一题 0.64难度单项选择更新时间:2013-05-23 11:27:09

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