单项选择题

I don' t understand why people ______ such a beautiful garden with cans and bottles.

A．located
B．provided
C．protected
D．littered
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单项选择题
The problem has been ______ my mind all day.
A．preying on
B．getting at
C．taking on
D．seeing to
单项选择题
The creation of UN was, perhaps, the most ______ achievement of the 20th century.
A．obscure
B．notable
C．acute
D．objective
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