单项选择题

It is ______ of you to walk down the street alone at midnight.

A．efficient
B．proud
C．bold
D．greedy
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单项选择题
Children are always happy. They can play ______.
A．for their heart's content
B．for their heart content
C．to their heart's content
D．to their hearts' content
单项选择题
People used to think that the earth was flat, ______
A．don't they
B．wasn't it
C．didn't they
D．usedn't it
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