_____ 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
推荐题目
So badly ______ in the accident that he was sent to a hospital.
#84010
A
did he hurt
B
he was hurt
C
was he hurt
D
be did hurt
____ I admire David as a poet, I do not like him as a man.
#84224
A
Only if
B
If only
C
As much
D
Much as
Knowing office rules -- whether ______ or not -- is important, especially for young job seekers.
#81045
A
written
B
writing
C
being written
D
having been written
If ____, the dirty air will lead you to fall ill.
#83097
A
breathe in
B
you to breathe in
C
breathing in
D
breathed in
— What are you going to do this weekend? — ______, I’m going to visit the Nature Museum.
#81430
A
If anything
B
If ever
C
If possible
D
If busy