[求助]GWD26-Q17

GWD 26 Q17 Asteroids
        
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.

答案给的是C 但will be to collide 是什么结构？D为什么不对呢？

请各位NN指点一下呀~~

表目的to do优于for

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

how likel....will be...

不过这题考试我应该选D...没时间去看这么细，C看到will be to do这个怪结构一定直接被我抛弃了