单项选择题

Up to now, we have tolerated self-destructive behavior and environmental vandalism on a global scale.

A．. To date
B．Until then
C．At present
D．Now that
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单项选择题
Parents have become increasingly concerned about the television viewing habits of their children.
A．interested in
B．worried about
C．disappointed with
D．indifferent to
单项选择题
When they built this office block, they gave no consideration to people in wheelchairs.
A．wonder
B．advice
C．thought
D．request
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