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【单选题】
下列语句中正确的是（ ）A.
任何数的零次是1
B.
单项式a的系数是1，次数都是0
C.
多项式a 2 - 1 2 a + 1 4 是由a 2 ， 1 2 a， 1 4 三项组成的
D.
数字0也是单项式
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