Yang Liwei was a student at this flight school from 1983 to 1987, he studied very hard and was made chairman of the Students’ Union.
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A
during which time
B
for which time
C
during whose time
D
by that time
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Shy people often avoid situations would force them into close contact with other people．
#76271
A
which
B
where
C
when
D
what
The science of computer, _______rapid progress has been made in recent years, is the most important of all science.
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A
which
B
with which
C
in which
D
to which
Water, _____ we cannot live, exists in the form of liquid, gas or solid.
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A
from which
B
on which
C
by which
D
without which