gwd题目求解惑

17.GWD-26-Q17

Respondingto the public’s fascination with-and sometimes undue alarm over-possible threats from asteroids, ascale developed byastronomers rates the likelihood that a particular asteroid or comet may collide with Earth.

A.    a scale developed byastronomers rates the likelihood thata particular asteroid or comet may

B.    a scale thatastronomers have developed rates how likelyit is for a particular asteroid or comet to

C.    astronomers havedeveloped a scale to rate how likely aparticular asteroid or comet will be to

D.    astronomers havedeveloped a scale for rating the likelihoodthat a particular asteroid or comet will

E.     astronomers havedeveloped a scale that rates the likelihoodof a particular asteroid or comet that may