You should inspect the wheels regularly, and replace them ______ they cause you trouble.
#31371
A
while
B
as
C
before
D
until
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________ enough time, but he couldn’t do it better.
#79873
A
He was given
B
Given
C
To be given
D
Though he was given
(2013·天津12区二模)He never thought that his success came ________ he least wanted it.
#30551
A
until
B
since
C
when
D
while
Jerry has promised to keep the secret, so he won’t tell anyone _____ asked to.
#31251
A
until
B
now that
C
unless
D
even though
Liming speaks English well________he were an English boy.
#33250
A
so that
B
even though
C
as though
D
now that