Although the police thought he was the most likely one, _____ they had no exact proof about it, they could not arrest him.
#32949
A
when
B
until
C
before
D
since
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He is a key ____________ in the murder so we must protect him from all kinds of danger.
#34297
A
witch
B
watcher
C
wizard
D
witness
(2013·吉林长春高中毕业班第一次调研)I'll make some sandwiches, just ________ we get hungry later.
#30544
A
even if
B
as though
C
if only
D
in case
Why not stay at home ______ the road is so slippery after the heavy snow?
#31925
A
in case
B
as long as
C
now that
D
even if