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
It is requested that you （ ） be present at the meeting tomorrow.
（A）must
（B）should
（C）can
（D）need
（ ） 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
