___ years ago, the population of China was over 20 million.
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A
Four hundreds
B
Four hundred
C
Four hundred of
D
Four hundreds of
推荐题目
The river through our city is about__________.
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A
6000 metres long
B
6000-meters-long
C
6000-metre-long
D
6000 metre long
.It’s reported that _______ fans have voted for their favourite singer online.
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A
twenty thousands
B
twenty thousand
C
thousands of the
D
several thousands
The swimming pool is ________.
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A
50-metre long
B
50 metres long
C
long 50 metres
D
long 50-metre
—How many students are there in your school?—_______ students, I think. 
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A
Thousand of
B
Three thousands
C
Three thousand
D
Three thousands of