问题
单项选择题
If you make different trade in different countries, you must take different transport modes? （）
A.Yes
B.Not
C.It must be based on cost
D.Not mention in the paragraph
答案
参考答案：C
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If you make different trade in different countries, you must take different transport modes? （）
A.Yes
B.Not
C.It must be based on cost
D.Not mention in the paragraph
参考答案：C