The doctor says that you will end up in hospital _________ you go on smoking like that.
#56599
A
unless
B
if
C
because
D
until
推荐题目
I don’t like science _______ it’s difficult.
#55838
A
but
B
so
C
because
D
and
___________ the young girl ___________ her parents take regular exercise in order to keep fit. 
#56037
A
Not ... but
B
Either ... or
C
Neither ... nor
D
Not only ... but also
Don’t worry! I’ll send you an e-mail              .
#57193
A
as soon as possible
B
as soon as possibly
C
as soon as can
D
as quick as possible