---Did Tom come back late last night?---No. It was not yet 8 o’clock ____ he arrived home.
#31145
A
before
B
when
C
that
D
until
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He was about to leave the office for home _______someone knocked the door and asked for some help.
#30110
A
until
B
while
C
as
D
when
(2012·衡阳高二检测) People often have the belief _______ a healthy environment and development cannot be possible at the same time, but this does not have to be true.
#30085
A
that
B
which
C
where
D
what
New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed,
#34049
A
as
B
which
C
what
D
that
Anger is good for you, ____ you control it properly, according to new psychology research.
#80632
A
whether
B
when
C
as long as
D
in case