Air pollution is getting more and more serious, so we must take action it is too late.
#31510
A
before
B
after
C
until
D
when
推荐题目
_____ the boy is determined to do something , no one can stop him.
#33101
A
Even if
B
Now that
C
Once
D
However
Best-selling author and race car driver Han Han offered a 20 million RMB reward to _____ could prove his works were ghostwritten (代笔).
#31940
A
no matter who
B
whoever
C
who
D
whomever
Success is how you are viewed by others, _______ achievement is something you do yourself.
#31899
A
while
B
in case
C
even if
D
as long as
Unlike watching TV, reading is a highly active process _______ it requires attention as well as memory and imagination.
#80214
A
until
B
but
C
unless
D
for
Istill remember the day when I said goodbye to my family, ________on the plane and started my journey to London.
#31182
A
to step
B
stepping
C
stepped
D
having stepped