I'am busy ( ) a plan ( ) the project.A to make,at B to make ,on C making,for D make,about.选哪个

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I'am busy ( ) a plan ( ) the project.A to make,at B to make ,on C making,for D make,about.选哪个

I'am busy ( ) a plan ( ) the project.A to make,at B to make ,on C making,for D make,about.选哪个
I'am busy ( ) a plan ( ) the project.A to make,at B to make ,on C making,for D make,about.选哪个

I'am busy ( ) a plan ( ) the project.A to make,at B to make ,on C making,for D make,about.选哪个
C be busy doing sth make a plan for sth.

选C。 be busy doing 表示忙于做某事,for。。表示为了。