[求助]885-7-13

13.   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（A）

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

答案A，C呢？

the extent to which或者to the extent that

只有以上2个固定结构