When deeply absorbed in work，________he often was，he would forget all about eating or sleeping.
#75247
A
that
B
which
C
where
D
when
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The computer, help we human beings have stepped into the information age, should be regarded as one of the most important inventions in the 20th century.
#75990
A
which
B
whose
C
with its
D
with whose
I could never_________ such a person ________ always complains everything.
#77043
A
come up with, who
B
put up with, as
C
end up with, who
D
live up to, as
Rock- climbing is a breathtaking sport， courage plays an important role.
#75364
A
which
B
whose
C
where
D
when