You should not go rafting ________ you know how to swim.
#31441
A
if
B
if not
C
when
D
unless
推荐题目
The factory has developed a lot____ we visited the advanced worker five yeas ago.
#34010
A
when
B
which
C
that
D
where
Don’t only give me a simple answer. Explain it _______ possible.
#30029
A
whatever
B
however
C
whoever
D
whenever
(2014·山东省蒙沂六校联考)Provide your doctor with a detailed medical history________he can give you accurate treatment.
#30036
A
even if
B
in case
C
so that
D
as though