单项选择题

Not a ______ has been found so far that can help the police find the criminal.

A．fact
B．clue
C．symbol
D．sign
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单项选择题
Comparison and contrast are often used ______ in advertisements.
A．extensive
B．effectively
C．intentional
D．beneficially
单项选择题
There must be a(n) ______ window somewhere--I can feel cold air coming in.
A．open
B．opened
C．opening
D．open-up
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