_____ 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
Only when I left my parents for Italy _____ how much I loved them.     
#81773
A
I realized
B
I had realized
C
had I realized
D
did I realize
 Not only _______interested in Beijing Opera but ______beginning to show an interest in it.
#80336
A
the father himself is; all his children are
B
the father himself is; are all his children
C
is the father himself; are all his children
D
is the father himself; all his children are
—We have to stop talking here outside. Listen, _____!—Hurry up, or we’ll be late.
#80929
A
there goes the bell
B
there does the bell go
C
there the bell goes
D
goes the bell there
He dressed up and went to the party as if ________.
#81193
A
was invited
B
had been invited
C
to be invited
D
invited