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
The dancers, all of _______ masks came off suddenly, gave us a great surprise.
#32153
A
their
B
whose
C
which
D
whom
Those who know ____ it was that wrote “ A Tale of Two Cities”, raise your hands.
#32403
A
why
B
whom
C
how
D
who
They were surprised that a child should work out the problem ________ they themselves couldn't.
#79772
A
once
B
then
C
While
D
if
I thought her nice and honest _________ I met her.
#30644
A
the first time
B
for the first time
C
first time
D
by the first time
The other day ,my father drove his car at _____I thought was a dangerous speed.
#32075
A
as
B
that
C
what
D
which