It was 80 years before Christopher Columbus c rossed the Atlantic ____ Zheng He had sailed t o East Africa.A.when B.that

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• It was 80 years before Christopher Columbus c rossed the Atlantic ____ Zheng He had sailed t o East Africa.A.when B.that C.after D.since 为什么不选A,就是当郑和下西洋时,比……早八十年,it指代郑和下西洋这件事
• 句子结构分析,求大神指点：It was 80 years before Christopher Columbus crossed the ...具体如下：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答案为什么选B. D怎么就不对了?答案解析说是强调句型,可我把it was that去掉后,句子就是：80 years before Christopher Columbus crossed the Atlantic,Zheng He had sailed to East Africa.这句话说的通吗?我感觉是说不通.80 years before Christopher Columbus crossed the Atlantic作时间状语感觉怪怪的.如
• It was 80 years before Christopher Columbus c rossed the Atlantic ____ Zheng He had sailed t o East Africa.A.when B.that
• 句子结构分析,求大神指点：It was 80 years before Christopher Columbus crossed the ...具体如下：
• 哥伦布Christopher Coiumbus?