Hi Alisha,
I think your question is asking whether the verb "holds" can take the infinitive form or not. (If you have the SC guide then this has been explained very well in the 7th chapter). If not and you want further explanation, please post back.
alisha.thakar Wrote:Eg. The theory holds that photons exhibit wave-particle duality.
As you say, this is a common usage. You are using the command subjunctive form here
Bossy verb (holds) + that + noun + Subjunctive (infinitive minus the "to")
alisha.thakar Wrote:Eg. The theory holds photons to exhibit wave-particle duality.
This sentence does sound a bit awkward but according the SC guide idioms chapter, this usage is not incorrect. However, it is considered suspect.
Basically, "holds" seems to be one of those verbs that can take either form but the subjunctive form is preferred on the GMAT.
Regards
Sunil