Doctors should take special care when treating children because their breathing rate is different from _____ of adults．
#15553
A
that
B
those
C
some
D
one
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We have made ______ clear that we are strongly against smoking in the office.
#15017
A
this
B
that
C
it
D
one
I’m very grateful to Professor Smith, without __________ help I would have never have got this far.
#15454
A
who
B
whose
C
whom
D
which