单项选择题

They have been raising horses and cows on their farms ______ many years.

A．after
B．for
C．since
D．by
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单项选择题
I like visiting Switzerland but it is getting ______ and more expensive.
A．harder
B．worse
C．more
D．nicer
单项选择题
Sean lives a ______ stressful life.
A．quite
B．very
C．quick
D．much
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