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
We made plans for a visit, but ______ difficulties with ear prevented it.
A．subordinate
B．succeed
C．successive
D．subsequent
单项选择题
The people for the experiment were chosen completely ______.
A．at length
B．in essence
C．at random
D．in bulk
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