Fill in the blank with a suitable option:
A woman from a travel agency helped us _________ a nice house.
Answer : B
In the sentence, "woman" is the Subject, "helped" is the verb and "house" is the object.
The structure of the sentence is that of Active Voice, i.e. Subject + Verb + Object. The subject is directly acting on the object.
And according to the grammar rules, the infinitive form of the verb is used in sentences with Active Voice. Only infinitives are used after certain verbs followed by nouns or pronouns referring to a person, in this case "us".
The infinitive form can be made by adding "to" before the base form of the verb.
Here, the infinitive verb of "choose", is "to choose".
And thus, the correct complete sentence is:
A woman from travel agency helped us TO CHOOSE a nice house.