The missing word in the sentence is 'have', making it 'she agreed to have her photo taken'. It is essential to maintain subject verb agreement for grammatical accuracy.
The sentence to be completed here is: "When we arrived, there were loads of reporters, and she agreed to_have her photo taken, which later appeared in all the tabloids." The correct word to fill in the blank is 'have'. Therefore, the complete sentence should read: "When we arrived, there were loads of reporters, and she agreed to have her photo taken, which later appeared in all the tabloids."
Looking at the reference sentences provided, we can determine that the sentence structure is important. For instance, the subject verb agreement is crucial as seen in the sentence: "Agreement with Everyone and Other Indefinite Pronouns". This applies to the main sentence because 'she' is a singular subject which should be followed by 'agreed to have', ensuring the sentence remains grammatically correct.
Complete question is:
When we arrived, there were loads of reporters, and she agreed to ___ her photo taken, which later appeared in all the tabloids.