One of the most important questions they had to consider was ______ of public health.
#15216
A
what
B
this
C
which
D
that
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Long years of hard work made _____ possible for him to enter a key university in Beijing.
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A
that
B
this
C
it
D
which
We have realised that ____ is much that can be done to help improve our environment.
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A
what
B
it
C
there
D
one