Microblog is a platform ________ people can express their thoughts and communicate with each other by sending posts.
#76890
A
which
B
where
C
what
D
when
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The Great Wall is a place ______ almost all tourists would like to visit when they come to Beijing．
#77585
A
why
B
which
C
when
D
where
If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
#77412
A
that
B
which
C
as
D
what
My father and his teacher talked a lot about the things and persons ___ they could remember.
#77622
A
who
B
which
C
what
D
that