单项选择题

A considerable amount of time and money has been invested in （）this system.

A.defining
B.implying
C. reducing
D. perfecting

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Her government, by its clear（）with many previous policies, has placed a double strain on the traditional relationship.

A. shatter
B. rupture
C. breach
D. collapse
单项选择题
An important business meeting demanded his ______.
A. presence
B. attendant
C. attending
D. presentation
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