问题描述：
_______ the stundents in the primary school is about three thousand,and ______of them are girls.
填数词
选项：
A.A number of ;two third
B.The number of; two thirds
C.A number of; two thirds
D.The number of; two third
填数词
选项：
A.A number of ;two third
B.The number of; two thirds
C.A number of; two thirds
D.The number of; two third
问题解答：
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