With the help of high technology, more and more new substances ______ in the past 10 years.
#71929
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
I’ll be late and Mother will be angry with me，but I don’t________it.
#67460
A
care for
B
care about
C
take care
D
take care of
Don’t be so discouraged. If you ______ such feelings, you will do better next time.
#71078
A
carry on
B
get back
C
break down
D
put away
Science and technology have in important ways __________ the improvement of agricultural production.
#72368
A
contributed to
B
resulted from
C
carried off
D
handed over
I know how busy you must be and naturally I wouldn’t want to too much of your time.
#71288
A
take up
B
speed up
C
sweep up
D
bring up