28. The farm as well as its neighboring hills we once spent so much time ____ on a new look as recently as last year.
| A．on having taken | B．has taken | C．on has taken | D．having taken |
Both parents and teachers work hard at either preventing failure or protecting the children from the knowledge_______ they have failed.
| A．where | B．why | C．which | D．that |
—What a pity! You should have urged him to hand in his English homework.
—I _______. But he wouldn’t listen to me.
| A．have done | B．did | C．had done | D．do |
As we all know, the world’s supplies of oil_________ up with the development of industry and the increase of cars.
| A．are being used | B．are using |
| C．have used | D．have been used |
It is reported that some wild animals were found_______ in a big cave in the mountain.
| A．to hide dead | B．hidden dead |
| C．hiding dead | D．hidden death |
．We’ve published large quantities of books. This year______ we’ve published three million copies.
| A．only | B．just | C．alone | D．simply |