Mr. Duncan raised an unnecessary question __________ he then failed to find an answer.
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A
to which
B
for which
C
with which
D
by which
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He wrote a long letter ___he explained what had happened in the accident.
#75723
A
what
B
which
C
where
D
how
Maria has written two novels，both of ________ have been made into television series.
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A
them
B
that
C
which
D
what
My daughter is going through an important stage ______ she must learn to live independently(独立的) in her life.
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A
where
B
which
C
what
D
when