Unable to select multiple items with list box

i'm using acrobat 9.0 standard.

 

i've added list box pdf , want give people option select multiple items in dropdown. in properties under options tab, selected "multiple selections." i'm unable make multiple selections despite this. still allows me make 1 choice.

 

any ideas? there other step(s) i'm missing?

i need asap company -- suggestions appreciated!

thank you

you have hold down ctrl key (cmd on mac) while clicking multiple items.

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