You should inspect the wheels regularly, and replace them ______ they cause you trouble.
#31371
A
while
B
as
C
before
D
until
推荐题目
Is this tourist attraction you paid a visit to several days ago?
#30600
A
that
B
which
C
the one
D
where
Many teenagers say that _____ they have a lot of friends, they really have no best friend.
#32317
A
when
B
while
C
if
D
because
Justin kicked the ball into his own goal. It was _____ his stupid kick that we won the game.
#31913
A
because
B
since
C
thanks to
D
according to
As many as ten courses are provided ,and you are free to choose suits you best．
#30189
A
whatever
B
whichever
C
however
D
wherever