Marketing plan was developed.

开发的营销计划。

Then came the marketing plan.

到了出营销计划的时候了。

I would say, can you spell marketing plan?

我会说，你会做市场计划吗？

What do you think about the marketing plan?

你觉得我们的市场计划怎么样？

90% of small businesses don't even have a marketing plan.

甚至有90%的小企业主连市场计划都没有。