Mike didn’t go to bed         his father came back.
#58111
A
till
B
because
C
so
D
if
推荐题目
--Lucy is doing her homework. ---Let’s ask Lily _______.
#58314
A
but
B
except
C
instead
D
instead of
Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
D
until
______ he is very busy, Li Ming always helps others.
#56088
A
Although
B
If
C
Unless
D
Since