----- Have you ever visited the 2010 Shanghai World Expo?
-----Yes．When I was in China , I ______ it twice．
| A．have visited | B．visited | C．had visited | D．would visit |
—I have a headache.
—I’m not surprised you ________ in front of the computer for too long.
| A．work | B．are working | C．have been working | D．had worked |
I have told you the truth. ________ I keep repeating it?
| A．Must | B．Can | C．May | D．Will |
I had been working on math for the whole afternoon and the numbers ________ before my eyes.
| A．swim | B．swam | C．swimming | D．had swum |
I am blessed with a great class, ________everyone is hardworking, kind and friendly to each other.
| A．one where | B．the one that | C．the one where | D．one that |
________ many times, he still repeated the same mistake.
| A．Having been told | B．Having told | C．Telling | D．Told |