What's your opinion about the requirement that an MBA student （ ） working experience?
（A）has
（B）will have
（C）have
（D）would have
（ ） 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
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
