The research is so designed that once________nothing can be done to change it.
#5001
A
begins
B
having begun
C
beginning
D
begun
推荐题目
Marty as well as his parents _________ to the opening ceremony the other day.
#4533
A
has invited
B
have invited
C
was invited
D
were invited
.Walking alone in the deserted village, John was scared. He thought he ______Tom to go with him.
#4735
A
might have asked
B
should ask
C
must have asked
D
should have asked
In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
#4939
A
species
B
group
C
amount
D
variety
The chief________of the year 2010 for Shanghai will be the Expo.
#4788
A
incident
B
event
C
affair
D
accident