单项选择题

Comparison and contrast are often used ______ in advertisements.

A．extensive
B．effectively
C．intentional
D．beneficially
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There must be a(n) ______ window somewhere--I can feel cold air coming in.
A．open
B．opened
C．opening
D．open-up
单项选择题
What ______ if I had been asked to join, I cannot tell.
A．would I have done
B．would I do
C．I would do
D．I would have done
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