单项选择题

Many people proposed that a national committee be formed to discuss ______ to existing mass transit systems.

A．substitutes
B．measures
C．duplicates
D．alternatives
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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
单项选择题
I've never ______ the theory that people are more important than animals.
A．subscribed to
B．hung on
C．engaged in
D．indulged in
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