1 . If Nina __________ that her husband would go to the bus stop to meet her, she wouldn’t have walked back home.

A．knows

B．knew

C．has known

D．had known

2 . He might have already recovered from his illness ________ the fact that he didn’t follow the doctor’s advice.

A．if it was not for

B．were it not for

C．if it should not be for

D．had it not been for

3 . If only we ________ ________ ________ and foreseen the circumstances. Now we have no one to blame but ourselves.
要是我们当时向前看并能预见将要出现的情况就好了。现在我们只能怪自己，怪不了别人。