There are six ________ people in the world． A. billions of B. billion of C. billion D. billions
2022-09-24 21:20:25 50次 黑龙江省大庆市杜尔伯特县2017-2018学年八年级（下）期中英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
There are six ________ people in the world．
A. billions of B. billion of
C. billion D. billions
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