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
Dear me! Just _________ at the time! I _________ no idea it was so late.
#104721
A
look, have
B
looking, had
C
look, had
D
looking, have
I have to go to work by taxi because my car _____ at the garage.
#100925
A
will be repaired
B
is repaired
C
is being repaired
D
has been repaired
With the development of modern society, E-mail as well as telephones an important part in daily communication.
#101452
A
have played
B
is playing
C
are playing
D
played
Dad, I was just wondering if you could lend me a few dollars until I _______ next week.
#100061
A
got paid
B
have paid
C
get paid
D
had been paid
He is the only one of the students who ________ a winner of schoolarship for three years.
#100559
A
is
B
has been
C
are
D
have been