If you add three nine ,you get twelve.A up B on C to D in

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If you add three nine ,you get twelve.A up B on C to D in
If you add three nine ,you get twelve.A up B on C to D in

If you add three nine ,you get twelve.A up B on C to D in
答案:C
add sth to sth.把...相加
不明白的再问哟,请及时采纳,多谢!