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题库 / Prep2012-SC-9
Roughly twice each century the planet Venus passes between the Earth and the Sun, an occasion known as a transit of Venus, during which it makes the outline of the planet visible in stark relief.
during which it makes the outline of the planet
during which the outline of the planet becomes
so that it makes the outline of the planet
such that during which the outline of the planet becomes
such that the outline of the planet becomes
题目分析：
略
选项分析：
A选项：during which是定语从句的关系词，其所修饰的先行词a transit of Venus在定语从句中作状语，在从句中，it也指代a transit of Venus，从句可以写为：
a transit of Venus makes the outline of the planet visible in stark relief during a transit of Venus.
出现的两次a transit of Venus中有一次是赘余的。
B选项：Correct. 本选项在语法和逻辑上均是正确的。
C选项：本选项中两个小句的因果关系不成立。我们不能说：因为金星每个世纪从地球和月球之间穿越两次，所以金星让星球的轮廓可见。（前后两句没有任何联系，或者说，这个因果关系之间存在明显的gap）
D选项：语法有误，such that 和during which都是连词，不能一起使用。
E选项：因果关系不成立错误同(C)。
选项A：冗余
an occasion known as 【a transit of Venus】, during which 【it（形式主语=先行词a transit of Venus）】 makes the outline of the planet visible in stark relief. （出现的两次a transit of Venus，所以冗余）
同理：
which 后面就不能加代词了。比如:
I like my dog, who is a lovely animal. （√）
I like my dog, who it is a lovely animal。（× ，∵冗余）
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