GWD26-17

17. GWD-26-Q17

Responding to the public’s fascination with-and sometimes
  undue alarm over-possible threats from asteroids, a scale
   developed by astronomers rates the likelihood that a particular asteroid or comet may collide with Earth.

A.      a scale developed by astronomers rates the likelihood
  that a particular asteroid or comet may

B.       a scale that astronomers have developed rates how
  likely it is for a particular asteroid or comet to

C.      astronomers have developed a scale to rate how likely
  a particular asteroid or comet will be to

D.      astronomers have developed a scale for rating the
  likelihood that a particular asteroid or comet will

E.       astronomers have developed a scale that rates the
  likelihood of a particular asteroid or comet that may

答案是C，但我选了D

答案是C，但我选了D

D错在哪里？ 谢谢！~~

D错在哪里？ 谢谢！~~

为什么会有这样的说法？