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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It was April 29, 2011 ______ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
#78083
A
that
B
when
C
since
D
before
He left here for Beijing in 1998 ,____I have heard nothing from her.
#77439
A
since then
B
since when
C
from then on
D
after that
---Why does she always ask you for help? ---There is no one else ________, is there?
#76926
A
who to turn to
B
she can turn to
C
for whom to turn
D
for her to turn