We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first

We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first
We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -one
D the century twenty-first

We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first
A.21世纪的说法是 the twenty--first centry
由于特指21世纪,所以要有定冠词,所以C错.
世纪要用序数词,所以B错.
数字在前,表示世纪的名词在后,所以B D都错.

选A
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A the twenty--first centry