—Why didn’t you go to yesterday’s meeting?
—I would have but I ______too busy working on the important experiment.
| A．had been | B．was | C．were | D．am |
_____ time, he’ll make a fist-class tennis player.
| A．Having given | B．To give | C．Giving | D．Given |
The picture ________ on the wall is painted by my nephew.
| A．having hung | B．hanging | C．hangs | D．being hung |
The managers discussed the plan that they would like to see _______the next year.
| A．carry out | B．carrying out | C．carried out | D．to carry out |
how to do the homework, I went to ask my teacher for help.
| A．Not to know | B．Not knowing | C．Knowing not | D．Not known |
You’d better leave the windows _________ and the door ___________.
| A．open, closed | B．opened, closing |
| C．opened, close | D．open, close |