In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
#30162
A
whether
B
until
C
if
D
unless
推荐题目
The entire hall burst into a great cheer and applause _______ the Nobel Prize winner appeared on the stage accompanied by the chairman.
#30997
A
until
B
while
C
by the time
D
the moment
The stranger shook me by the hand warmly ___ he were to say he knew me well.
#31559
A
even if
B
when
C
if
D
as if
You can make a complaint to the local government ____you are happy with the way things are.
#30961
A
unless
B
if
C
once
D
as
一Why didn’t you try your best to get on the bus?一I tried to，but I could，it started moving．
#31704
A
when
B
after
C
until
D
before