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

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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
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.如果是80 years ago,我还看得懂.
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求大神指点!

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
壮语没错,可能你不太习惯
语序倒一下：
Zheng He had sailed to East Africa （80 years） before Christopher Columbus crossed the Atlantic
如果不能理解,可以试着先不看 80 years
Zheng He had sailed to East Africa before Christopher Columbus crossed the Atlantic
在哥伦布横跨大西洋以前,郑和已经远航去东非了.
加油哦!

这句话是说在克里斯托弗.哥伦布横穿大西洋的八十年前，郑和就航行到了东非。
since是“自……以来，自……以后”，放在句子中的话句子前后就讲不通了。这句话考查的就是强调句，迷惑性比较强，去掉it was和that之后，把80 years before...这个时间状语后置读起来比较通顺，如下：Zheng He had sailed to East Africa 80 years befor...

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这句话是说在克里斯托弗.哥伦布横穿大西洋的八十年前，郑和就航行到了东非。
since是“自……以来，自……以后”，放在句子中的话句子前后就讲不通了。这句话考查的就是强调句，迷惑性比较强，去掉it was和that之后，把80 years before...这个时间状语后置读起来比较通顺，如下：Zheng He had sailed to East Africa 80 years before Christopher Columbus crossed the Atlantic。前半部分是过去完成时，后半部分是一般现在时，中间表示时间关系的before，这样整个句子结构就很明显了。

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