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
________ to playing games recently，he is easy to feel sleepy in class.
#4517
A
Addicted
B
Addicting
C
Having addicted
D
To addict
--- Did you find the pen yesterday?--- No, I didn’t find ________, but I have bought ________.
#4883
A
it; it
B
one; it
C
it; one
D
one; one
.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
He regards that book _____ one of the worst that he’s _____ read.
#4813
A
to be, ever
B
to be, never
C
as, ever
D
as, never