请翻译“促销将在3天后结束”成英语，谢谢

“结束”是一个延续性动作，所以动词应该选用be over。
Promotion will be over in three days.

The promotion program will end in three days.

Promotion will be over in 3 days.

Promotion will be ended in 3 days.
Promotion close in 3 days

The special sale would end after three days.

The promotion is available for 3 days