单项选择题

March is the ______ month of a year.

A．three
B．third
C．three times
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单项选择题
The ______ month of the year is December.
A．third
B．twelve
C．twelfth
单项选择题
The children are standing ______ the starting line and are ready ______ run.
A．at;to
B．at;for
C．in;to
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