You can’t imagine ______ when I received your letter.
| A．how excited I was | B．how excited was I |
| C．how I was excited | D．I was how excited |
We arrived at work in the morning and found that somebody ________ into the office during the night.(2011·江西)
| A．broke | B．had broken |
| C．has broken | D．was breaking |
By the time Jack returned home from England，his son ________ from college.(2011·辽宁)
| A．graduated | B．has graduated |
| C．had been graduating | D．had graduated |
In the last few years thousands of films ________ all over the world.
| A．have produced | B．have been produced |
| C．are producing | D．are being produced |
— Alvin，are you coming with us?
—I'd love to，but something unexpected ________.
| A．has come up | B．was coming up |
| C．had come up | D．would come up |
—I remember you were a talented pianist at college.Can you play the piano for me?
—Sorry，I ________ the piano for years.(2012·湖南)
| A．don't play | B．wasn't playing |
| C．haven't played | D．hadn't played |