people came to the Great Wall during May Day Holiday.  
#51416
A
Million
B
Millions of
C
Million of
D
Ten millions
推荐题目
More than two _______years ago, people knew little about the universe.
#51657
A
thousands
B
thousand
C
thousands of
D
thousand of
 —How old is Steve?—He is ____________ and he has an ___________ sister.
#51515
A
13-year-old; 10 years old
B
13 years old; 11-year-old
C
13 years old; 10-years-old
D
13-years-old; 11-years-old
Shanghai is  ______ years old.
#51757
A
seven hundred
B
seven hundreds
C
seven hundreds of
D
seven hundred of
After the earthquake,        soldiers went to Sichuan to help the people there.
#51492
A
two thousands
B
thousand of
C
thousands of
D
thousands