单项选择题
A.12个月 B.13个月 C.14个月 D.15个月
A.1/4 B.2/5 C.3/6 D.4/7
A.1/10 B.2/10 C.3/10 D.4/10
A.1/20 B.2/20 C.3/20 D.4/20
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