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.

这道题的答案怎么有两个版本，一个C,一个D,我个人认为是C,是对的吗？

偶觉得是C

不知道对不对啊