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