No commas with 'in fact'

[Ignat]

Test No. incompl/advan-82 "GMAT Verbal Quiz (5)", question 4

You can have that car in any colour you want in fact you have a ......... of 24 different ones.

(a) choice
(b) choosing
(c) number
(d) shade

Test No. incompl/advan-82 "GMAT Verbal Quiz (5)", answer 4

You can have that car in any colour you want in fact you have a choice of 24 different ones.

Correct answer: (a) choice

Your answer was: correct
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Why is "in fact" here without commas?

Ignat

[Alan]

Don't use commas unless you have to. They indicate a pause in the speech and there is no pause here.
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