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
Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.
A．sinking behind
B．falling behind
C．drawing behind
D．crawling behind
单项选择题
There is hardly any ______ hotel room available during the summer holidays.
A．vacant
B．empty
C．free
D．blank
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