单项选择题

Three months had elapsed before the great invasion plan began to ______.

A．uncover
B．reveal
C．unfold
D．release
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单项选择题
High production rates are often achieved at the ______ of quality of work.
A．expense
B．exposure
C．expansion
D．expectation
单项选择题
Labor needs to match its ______ to spending with innovative ideas about service delivery, financing and management.
A．obligation
B．determination
C．resolution
D．commitment
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