单项选择题

--How far is it from here to your school--About six _________ walk.

A． minute
B． minutes
C． minutes'
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单项选择题
What's this _________ English It's key.
A． with
B． in
C． for
单项选择题
The sentence is hard to understand _________ there are no new words in it.
A． but
B． because
C． though
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