They have made so great progress      .
#51890
A
three years ago
B
for three years
C
in the past three years
D
before three years
推荐题目
There are ______________ birds there in the sky.    
#51475
A
Million of
B
five millions of
C
millions of
D
five millions
Eight and two is     .
#51589
A
six
B
ten
C
sixteen
D
nine
It is reported that _______ people in the world are suffering from the H1N1 flu.
#51225
A
ten thousand of
B
ten thousands
C
thousands of
D
ten thousands of
There are two _______students in my school.
#51822
A
hundreds
B
hundred
C
hundreds of
D
hundred of