14. (单选题) Researchers cannot ______ the possibility that Earth may one day run out of its orbit.(本题5.0分) A、 hand out B、 drop out C、 rule out D、 keep out

14. (单选题) Researchers cannot ______ the possibility that Earth may one day run out of its orbit.(本题5.0分)
A、 hand out
B、 drop out
C、 rule out
D、 keep out

出自：陇东学院-大学英语2(专升本)

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