--- Oh, dear. I forgot the air tickets.
--- You ______ something.
| A．have left | B．are always leaving |
| C．are leaving | D．always left |
（2012全国新课程）I don't believe we've met before, I must say you do look familiar.
| A．therefore | B．although |
| C．since | D．unless |
I had hardly got to the office ______ my wife phoned me to go back home at once.
| A．when | B．than | C．until | D．after |
—Look at those clouds!
—Don’t worry. ______ it rains, we’ll still have a great time.
| A．Even if | B．As though | C．In case | D．If only |
All the photographs in this book, _______ stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |
Hot _______the night air was, we slept deeply because we were so tired after the long journey.
| A．although | B．as | C．while | D．however |