If the traffic （ ） so heavy, I could have been back by 6 o’clock.
（A）hadn’t been
（B）wasn’t
（C）couldn’t be
（D）hasn’t been
If I （ ） for my English test, I wouldn’t have got such a low grade.
（A）had prepared
（B）prepared
（C）were to prepare
（D）have prepared
（ ） if I had arrived yesterday without letting you know beforehand?
（A）Would you be surprised
（B）Were you surprised
（C）Had you been surprised
（D）Would you have been surprised
