Yesterday I had a word with the CEO of the company, ___ who used to teach at Beijing University．
| A．one | B．the one | C．that | D．it |
I have to see the doctor because I ________ a lot lately.
| A．have been coughing | B．had coughed |
| C．coughed | D．cough |
—Why，Jack，you look so tired!
—Well，I ________ the house and I must finish the work tomorrow.
| A．was painting | B．will be painting |
| C．have painted | D．have been painting |
Tom ________ in the library every night over the last three months.(2011·北京)
| A．works | B．worked |
| C．has been working | D．had been working |
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 |