题目内容:
In 1847 most countries of the world were ______.
A. not yet using postage stamps
B. collecting valuable stamps
C. buying stamps from Neuritis
D. printing their own stamps
参考答案:【答案仅供学习,请勿对照自行用药等】
In 1847 most countries of the world were ______.
A. not yet using postage stamps
B. collecting valuable stamps
C. buying stamps from Neuritis
D. printing their own stamps