单项选择题

The plan for unity under a federal system ______ into effect in 1782.

A．put
B．got
C．went
D．set
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单项选择题
Do you know how much the ______ family spends on food in the urban area
A．normal
B．general
C．usual
D．average
单项选择题
Nowadays, books are expensive. Every time I go to the bookstore, I seem ______ more.
A．to be spending
B．spending
C．to spending
D．spend
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