单项选择题

There has been a decline in local ______national advertising.

A． therefore
B． so
C． but
D． and
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单项选择题
______ there were so many options, everyone was satisfied.
A． If
B． Why
C． Because
D． When
单项选择题
______all the references to verify the information.
A． Look by
B． Look out
C． Look up
D． Look to
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