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
推荐题目
—The boys hid themselves in the places ________ they couldn’t be found.—How naughty(淘气的) they are!
#77405
A
that
B
which
C
where
D
in that
The building the windows are bright at night is our school library.
#77311
A
that
B
which
C
whose
D
of which
In the study of modern science, there are many cases _____ soldiers can teach officers．
#78321
A
when
B
who
C
which
D
where
Saving money is ________ we must do.
#78191
A
what that
B
anything that
C
something that
D
something which