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
—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
