My brother，______ his classmates often made fun a few years ago，is now studying in England．
#78210
A
of whom
B
who
C
about whom
D
whom
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The school _____you visited yesterday is the place ____I once learned .
#78454
A
where; that
B
where; where
C
which; where
D
that; which
______is known to us all, only the theory ______ on practice can be practical.
#76757
A
Which; base
B
Which; based
C
As; based
D
As; basing
He made another wonderful discovery, _______ of great importance to science.
#76145
A
which I think is
B
which I think it
C
which I think it is
D
I think which is
Global warming has become a serious problem, ______ we must find solutions.
#75061
A
which
B
to which
C
with which
D
that