单项选择题

A．a
B．an
C．the
D．some
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单项选择题
A．childrenB．theyC．five-year-oldsD．six-year-olds
A．children
B．they
C．five-year-olds
D．six-year-olds
单项选择题
A．followingB．precedingC．afterD．past
A．following
B．preceding
C．after
D．past
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