此题答案为C,但E缘何不可?
17. 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
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