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
Wishing to get a million in the lottery， many among us now do，is simply foolish．
#33513
A
which
B
what
C
as
D
that
He _______ his gun under the tree where he was __________.
#32988
A
lay; laying
B
laid; lying
C
lied; laying
D
lay; lying
—I think George doesn't really care for TV plays.—Right, ________he still watches the program.
#30287
A
and
B
but
C
or
D
so