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frequently
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单项选择题
A．The underground oil resources have not been affected.B．Most of the desert animals and plants have managed to survive.C．The oil lakes soon dried up and stooped evaporating.D．The underground water resources have not been affected.
A．The underground oil resources have not been affected.
B．Most of the desert animals and plants have managed to survive.
C．The oil lakes soon dried up and stooped evaporating.
D．The underground water resources have not been affected.
单项选择题
A．He usually talks quietly.B．He usually assigns homework.C．He didn’t teach class today.D．He noticed that the students didn’t do their homework..
A．He usually talks quietly.
B．He usually assigns homework.
C．He didn’t teach class today.
D．He noticed that the students didn’t do their homework..
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