摘要：16． and milkMarylunch
网址：http://m.1010jiajiao.com/timu_id_807164[举报]
The window ________ ten minutes ago, and the room is bright now.
- A.can be cleaned
- B.is cleaned
- C.was cleaned
- D.will be cleaned
Of all the inventions, what do you think is ________ invention in the 21st century．
- A.the most helpful
- B.more helpful
- C.helpful
- D.more and more helpful
We went to the beach last Sunday, and we had great fun ________ volleyball．
- A.play
- B.playing
- C.played
- D.to play