单项选择题

You must pay import ______ on certain goods brought into this country.

A. money
B. fees
C. bills
D. duties
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单项选择题
All the information we have collected in relation to that case ______ very little.
A. comes up to
B. makes up for
C. stands up for
D. adds up to
单项选择题
The ______ of AIDS has led to an expansion in research seeking a cure.
A. innovation
B. selection
C. proliferation
D. conviction
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