Walmart, which is one of the largest American supermarket chains, some of its stores open 24 hours on Mondays through Saturdays.
| A．keeps | B．keep | C．have kept | D．had kept |
In order to find the missing child，villagers ________ all they can over the past five hours.(2012·安徽)
| A．did | B．do |
| C．had done | D．have been doing |
—Hi, Susan, where were you at lunch time？I ________ a seat for you in the coffee shop.
—Oh, sorry to miss you.My political science class ran longer than usual.
| A．am saving | B．was saving |
| C．had saved | D．have saved |
—Mum, you should have taken me to the park this morning.
—I had planned to, but I couldn't afford the time.I ________ a lecture.
| A．had given | B．gave |
| C．was giving | D．would give |
—When did the computer crash?
—This morning，while I ________ the reading materials downloaded from some websites.(2012·福建)
| A．have sorted | B．was sorting |
| C．am sorting | D．had sorted |
After school we went to the readingroom to do some reading，only to be told that it ________.(2012·安徽)
| A．was decorated | B．had decorated |
| C．had been decorating | D．was being decorated |