单项选择题

A．snow
B．expected
C．usual
D．well
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单项选择题
A．Five and a half years.B．Six years and six months.C．Four and six months.D．Seven and a. half years.
A．Five and a half years.
B．Six years and six months.
C．Four and six months.
D．Seven and a. half years.
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