Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
#31345
A
before
B
once
C
until
D
unless
推荐题目
Please pass me the dictionary ______ cover is made of plastics.
#30902
A
whose
B
of which
C
that
D
which
Find ways to praise your children often,_____ you’ll find they will open their hearts to you.
#32927
A
till
B
or
C
and
D
but
I am a determined person. ____ I have made up my mind, nothing can change my mind.
#31780
A
Once
B
Though
C
Unless
D
Until