Guess what! I came across my primary school science teacher this morning, ______ I have lost touch for almost 20 years.
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A
of which
B
when
C
with whom
D
who
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 Recently I bought an ancient Chinese vase, _______ was very reasonable.
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A
which price
B
the price of which
C
its price
D
the price of whose
 After ____ seemed like hours he came out with a bitter smile.
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A
which  
B
it
C
what 
D
that
_________ is known to all,good friends _________ happiness and value to life.
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A
It; add
B
As; add
C
It; add up
D
As; add to