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题目内容
（乐山师范学院第二外语(英语））
In 1840, the cost of mailing a letter was mainly determined by_ _
A. the weight of the letter
B. . how important the message was
C. how far the postmen had to travel
D. the number of letters sent on a certain day
A. the weight of the letter
B. . how important the message was
C. how far the postmen had to travel
D. the number of letters sent on a certain day
参考答案