In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
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in which
B
on which
C
at which
D
to which
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This is the biggest lab__________we have ever built in our university.
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A
which
B
what
C
that
D
Where
In spite of all has been said，quite a lot of people are still uncertain about the prices of housing in China．
#78023
A
that
B
what
C
which
D
as
The App WeChat provides a networking platform ______ communication is faster and easier.
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A
which
B
where
C
when
D
why
Taobo is Asia's largest retail（零售的） network platform, ______ people can buy and sell many kinds of things．
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A
where
B
when
C
that
D
whose