单项选择题

______ are for ______ cutting things.

A．Knives, used
B．Knives, using
C．Knife, used
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单项选择题
It takes us ______ hour or more to go to my hometown by ______ train.
A．an, a
B．a, an
C．an, 不填
单项选择题
I think the story is not as ______ as that one.
A．most interesting
B．interesting
C．interested
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