单项选择题

Let's _________ the bird from the case.

A．liberate
B．put
C．set
D．free
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单项选择题
She regarded the burglary as a(n) _________ of her home.
A．invasion
B．suppression
C．violation
D．theft
单项选择题
In his _________ to further his knowledge of the universe, man has now begun to explore space.
A．endeavor
B．expedition
C．trail
D．chase
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