单项选择题

We could go to a concert _________ you'd prefer to visit a museum..

A．if
B．because
C．unless
D．since
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单项选择题
_________ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.
A．That
B．It
C．this
D．As
单项选择题
Your advice would be _________ valuable to him, who is now at a loss as to what to do first.
A．exceedingly
B．excessively
C．extensively
D．exclusively
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