(2013·陕西宝鸡二模)The British are not so familiar with different cultures and other ways of doing things, ________ is often the case in other countries.
#67327
A
that
B
who
C
where
D
as
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I wouldn't manage to do it___ you had explained how.
#73583
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unless
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I have two grammars, ______are of great use. 
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all of which
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how much does it cost
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The engineer ______my father works is about 50 years old. 
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