Some scientists believe that there will be more robots in       years.
#50952
A
hundreds of
B
hundred of
C
two hundreds of
D
two hundreds
推荐题目
---How often does he go to the Swimming Club? ---________.
#51832
A
Two hours
B
Twice
C
Two a day
D
Twice a week
--It’s said that __________ people died from car accidents in 2011. --How terrible! 
#51646
A
10 thousands
B
thousand of
C
10 thousands of
D
thousands of
_________ trees have been planted these years.
#51783
A
Million
B
Millions
C
Million of
D
Millions of
There are       people in the supermarket. It’s so crowded.
#51561
A
hundred
B
hundreds
C
hundreds of
D
hundred of
________ people died in the war.
#51856
A
Two thousands
B
Thousands of
C
Two thousands of
D
Two thousand of