单项选择题

A．Water can only be used once.
B．Used water can be recycled.
C．Recycled water is unfit for drinking.
D．Only rain-water is drinkable.
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单项选择题
A．The woman should get another job.B．The woman should be more patient.C．The woman congratulated the wrong person.D．The woman was waiting in the wrong.
A．The woman should get another job.
B．The woman should be more patient.
C．The woman congratulated the wrong person.
D．The woman was waiting in the wrong.
问答题
S5. Not every greeting letter to Santa will be replied by postal clerk of Santa Claus’ village post office unless ______.
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