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

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单项选择题
The time of waiting for payment agreed upon by both sides is the period of （）.

A. shipment
B. draft
C. hill of lading
D. credit
单项选择题
Our business has been slack （） three months.

A. in
B. within
C. over
D. for
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