单项选择题


A．after
B．before
C．when
D．as
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单项选择题
A．16.B．17.C．18.D．19.
A．16.
B．17.
C．18.
D．19.
单项选择题
A．Half a year.B．Two years.C．Three or four years.D．More than five years.
A．Half a year.
B．Two years.
C．Three or four years.
D．More than five years.
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