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
.The horses________each other________the first prize in the match. 
#4781
A
competed against; for
B
competed against; to
C
completed against; for
D
completed; to get
Jenny nearly missed the flight______ doing too much shopping. 
#5027
A
as a result of
B
on top of
C
in front of
D
in need of