单项选择题

I don't understand why people______such a beautiful garden with cans and bot- tles.

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 car prevented it.
A．subordinate
B．succeed
C．successive
D．subsequent
单项选择题
Efforts to reach the injured men have been______because of a sudden deteriora tion in weather conditions.
A．enforced
B．intensified
C．continued
D．strengthened
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