单项选择题


A．poison
B．rubbish
C．waste water
D．dirt
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单项选择题
A．in the pastB．sometimesC．not yetD．for some time
A．in the past
B．sometimes
C．not yet
D．for some time
单项选择题
A．consideredB．called asC．regardedD．said as
A．considered
B．called as
C．regarded
D．said as
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