问题
单项选择题
Tariffs may （） on commodities leaving an area or on merchandise entering an area.
A. levy
B. be levied
C. effect
D. be effected
答案
参考答案：B
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Tariffs may （） on commodities leaving an area or on merchandise entering an area.
A. levy
B. be levied
C. effect
D. be effected
参考答案：B