A. SELECT 姓名 FROM students WHERE 出生年月<#1999/1/1# AND 性别="女"

B. SELECT 姓名 FROM students WHERE 出生年月<1999/1/1 AND 性别="女"

C. SELECT 姓名 FROM students WHERE 出生年月<"1999/1/1" AND 性别="女"

D. SELECT 姓名 FROM students WHERE 出生年月<#1999/1/1# AND 性别=女