If the new safety system （ ） to use, the accident would never have happened. （A）had been put （B）were put （C）should be put （D）would be put
Do you have Betty’s phone number? — Yes. Otherwise, I （ ） able to reach her yesterday. （A）hadn’t been （B）wouldn’t have been （C）weren’t （D）wouldn’t be
（ ） not for the support of the teachers, the student could not overcome her difficulty. （A）It were （B）Were it （C）It was （D）Was it
I was wearing a seat belt. If I hadn’t been wearing one, I （ ）. （A）were injured （B）would be injured （C）had been injured （D）would have been injured
Had the governments and scientists not worked together, AIDS - related deaths （ ） since their highest in 2005. （A）had not fallen （B）would not fall （C）did not fall （D）would not have fallen
