og57

57. In astronomy the term "red shift" denotes the extent to which light from a distant galaxy has been shifted toward the red, or long-wave, end of the light spec­trum by the rapid motion of the galaxy away from the Earth.

(A)  to which light from a distant galaxy has been shifted

(B)   to which light from a distant galaxy has shifted

(C)  that light from a distant galaxy has been shifted

(D)  of light from a distant galaxy shifting

(E)of the shift of light from a distant galaxy

AnswerA)

我觉得(C)没错啊，反而是(A)我觉得不正确，因为本句已有个toward，前面怎么能再加个to呢?

to "extent", toward "end",两个介词都必不可少

In astronomy the term “red shift” denotes the extent to
    which light from a distant galaxy has been shifted toward the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away from the Earth.

which  指代 前面的extent, 在从句中做from a distant galaxy to 的介词宾语；OG多次指出，当定语从句中的指示代词which担任从句中的介词的宾语时，介词需要前置于该which前，而toward the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away from the Earth.部分是shifted的状语；此处的toward与前面的to没有联系，也就不存在语义重复的问题

此处的中文意思是：

引用前面某位仁兄的翻译：