【单选题】
The thieves _____the waste paper all over the room while they were searching for the diamond ring.
①
spread
②
scratched
③
scattered
④
burned
【单选题】
They have done things they ought_____.
①
not to do
②
not to be done
③
not to have done
④
not having done
【单选题】
The work will be finished ___________ , but I dont know when.
①
sometimes
②
some times
③
some time
④
sometime
【单选题】
They dont____________ the importance of this problem.
①
understands
②
understood
③
understanding
④
understand