OG 一道小语法

real700

各位大神 求问OG 这道语法~~

【OG19-P703-691题】

To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.

• A
  
  To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by
  
  
  
• B
  
  Estimating the expansion rate of the universe is a notoriously difficult problem because there is no single yardstick by which all distances can be measured
  
  
  
• C
  
  Because there is a lack of a single yardstick to measure all distances by ,estimating the expansion rate of the universe is a notoriously difficult problem
  
  
  
• D
  
  A notoriously difficult problem is to estimate the expansion rate of the universe because a single yardstick is lacking by which all distances can be measured
  
  
  
• E
  
  It is a notoriously difficult problem to estimate the expansion rate of the universe because by no single yardstick can all distances be measured
  
  
  答案是B  我弄不明白D  D可以还原为 a yardstick (which all distances can be measured by )is lacking
  为了避免头重脚轻 by引导which提前。请问是逻辑方面错了吗 不太理解 谢谢！
  
  
  
  
  
  
  
  

蟹黄味蚕豆

which放的位置不好，放在了lacking后面

几许VV

以及没有必要用现在进行时，再以及is lack 不如 there is no简介清楚

Rieu

D should read:

It is a notoriously difficult problem to estimate...because a single yardstick by which all distances can be measured is lacking.
"Is lacking" as an idiom exists. See the Idiom Appendix of Manhattan.