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
看到这道题里面的EXTENT, 这个词我总是弄不清楚是什么意思, 看上去似乎很复杂， 很多样,
请教高手,
有其他例子关于这个词吗?
这个词在GMAT里面出现的频繁吗?
记住extent的两个固定用法应该就可以了：
1. the extent to which
2. to the extent that
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