Some scientists think that it may take ______ years to make robots look like people, and do the same things as us.
#51234
A
hundreds of
B
two hundreds of
C
two hundreds
D
hundreds
推荐题目
_____ the fans are waiting for the popular singer outside the concert hall.
#51873
A
Two thousand
B
Thousands of
C
Two thousands of
D
Two thousand of
 ___ years ago, the population of China was over 20 million.
#51584
A
Four hundreds
B
Four hundred
C
Four hundred of
D
Four hundreds of
_________ should not be allowed to go out at night. 
#51907
A
Twelve-years-old
B
Twelve-year-olds
C
Twelveyearold
D
Twelveyearsolds
--- How many books does the little boy have?---He has         books.
#51577
A
two thousands
B
one thousand of
C
thousands of
D
two thousands of
There are ________ people having lunch at this restaurant every day.
#51878
A
hundred of
B
hundreds of
C
two hundreds
D
two hundred of