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一道SAT语法题37. Fabric was very expensive in the United States b

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一道SAT语法题
37. Fabric was very expensive in the United States before the undustrial revolution, this is why scraps were saved and recycled into such items as patchwork quilts and doll clothes.
A. revolution, this is why
B. revolution, this explains why
C. revolution, and so
D. revolution and so that
E. revolution; resulting in
为什么选C?and 和 so 不都是连词吗?连词不是不可以连用吗?
这里and so 连用确实有些不妥但也只是不简洁但无语法错误和别的选项的语法错误比起来实在不足为提
A B两句之间无连词属于run-on 结构(why连接的是宾从)
E中resulting无逻辑主语且分号不对
所以先排除ABE
DC比较
D中的so that 连接结果状语从句的 而状语是不需要用and连接的,虽然意思表达出来 犯了语法错误
C中虽然出现两个连词不妥,但不属于语法错误 举例:that which就可以连用相当于what,虽然that which很麻烦 遇到what 就得代替 但是从语法角度确实没错!