If I ______ about this computer program, a hage amount of time and energy would have been saved.
#87162
A
know
B
knew
C
had known
D
have known
推荐题目
Without you, I _______ the first prize in the speech contest. Thank you, John.
#86802
A
can’t win
B
won’t win
C
hadn’t won
D
wouldn’t have won
You    park  here! It’s an  emergeney  exit.
#87821
A
wouldn’t
B
needn’t
C
couldn’t
D
mustn’t
 I’m sorry. __________ for my illness, I would have come to give you a hand.
#86803
A
Were it not
B
If it hasn’t been for
C
Had it not been
D
Shouldn’t it be