At the beginning of class, the noise of desks _____ could be heard outside the classroom. 
#98029
A
opened and closed
B
to be opened and closed
C
being opened and closed
D
to open and close
推荐题目
___ H1N1 flu from spreading, our government has taken some effective measures.
#96789
A
Prevent
B
Preventing
C
Prevented
D
To prevent
-What made you so delighted at Christmas? -__________.
#95298
A
I received many more presents than others
B
Because my parents promised me a new car
C
My uncle’s coming back from abroad
D
As there was an unusual celebration
 I _______ that the job has been filled.
#96610
A
regret to say
B
regret saying
C
regret to have said
D
regret said