Only after Mary read her composition the second time ________ the spelling mistake.(2012·天津)
#79832
A
did she notice
B
she noticed
C
does she notice
D
she has noticed
推荐题目
The top student failed again in the examination and only then ______ the importance of reading and memorizing the English texts.
#81715
A
he realized
B
he had realized
C
had he realized
D
did he realize
Never_____ to the foreign invaders, no matter how powerful they seem to be.
#79640
A
we can give in
B
we should give up
C
can we give in
D
should we give up
and we’ll finish the work ahead of time.
#81981
A
An hour earlier
B
If we start an hour earlier
C
Starting an hour earlier
D
Started an hour earlier
_____ that air conditioners cause so much pollution, I would never have bought one.
#83033
A
Had I known
B
I had known
C
Were I to know
D
Did I know
Some scientists believe that it won’t be long _______ robots are widely used in all walks of life．
#82112
A
since
B
after
C
before
D
until