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_____ is known to all, paper was first made in China. 
#71980
A
It
B
That
C
Which
D
As
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He lost his favorite watch, _________ made him very sad.
#68676
A
that
B
it
C
which
D
as
Go and get your coat. It’s 　　you left it.
#68650
A
there
B
where
C
there where
D
where there
— Hasn’t the thief admitted his crime by now?— No, ______ questioned many times.
#66860
A
if
B
though
C
unless
D
once
_____ he has done it is surprising. _____ he has done is surprising. 
#71976
A
What
B
That
C
Whether
D
If
I have _______ much work to do _______ I have no time to go out with you.
#41403
A
such; that
B
so; that
C
so; as
D
such; as