18. (单选题) Some of these stars have planets orbiting them, and ______ many billions of these planets could support life. ( )(本题2.0分) A、 as far as it concerns B、 there are possibly C、 chances are that D、 it is sure to say that

18. (单选题) Some of these stars have planets orbiting them, and ______ many billions of these planets could support life. ( )(本题2.0分)
A、 as far as it concerns
B、 there are possibly
C、 chances are that
D、 it is sure to say that

出自：西安石油大学英语二

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