Sun Tiantian , _______ , is a professional tennis player from Zhengzhou.
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A
a eighteen years old girl
B
an eighteen-year-old girl
C
an eighteen years old girl
D
a eighteen-year-old girl
推荐题目
The Changjiang River is _________in the world.
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A
a longest river
B
the longest river
C
one of the longest river
D
one of the longest rivers
There are many _______ playing on the playground. 
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A
child
B
children
C
man teachers
D
sheeps