With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
The police questioned William closely and he finally admitted ________the car.
#101554
A
to steal
B
having stolen
C
to have stolen
D
steal
---That must have been a terrible experience．---Yeah．I in the damaged car，unable to move．
#99622
A
was stuck
B
have been stuck
C
am stuck
D
had been stuck．
Large quantities of information, as well as some timely help ________ since the organization was built.
#100487
A
has offered
B
had been offered
C
have been offered
D
is offered
“What are you busy for?”—This is a question we very often get _____ nowadays.
#100536
A
asking
B
being asked
C
asked
D
to ask
—What do you think of the film Avatar?—It________be better.I even want to see it twice.
#101054
A
couldn’t
B
won’t
C
shouldn’t
D
mightn’t