People from the West like to use such expressions as “please” and “thank you” in cases ______ some people in Asia may not think it necessary. 
#32094
A
what
B
which
C
that
D
where
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 Mr. Green has made another wonderful discovery,  ______ great importance to science.
#34201
A
which I think is of
B
which I think it is of
C
that I think is of
D
I think which is of