Future indicative with "nos"

Question

I had this fill in the blank question:

Nos __ volver a veros.

With these answer choices:

Alegraremos Alegrarán Alegraré Alegraréis Alegrarás Alegrará

I selected the first choice, alegraremos, so the sentence would say: We are happy to see you again. But the correct answer was apparently the last choice, alegrará. Isn't that the conjugation for the 3rd person singular? I don't see how that could work with the first person plural, "nos." Any explanations? Thank you for your help!

Answer 1

Nos alegrará volver a veros.

In this sentence, "volver a veros" is the subject, "nos" is object.

Literally, Seeing you again makes us happy.

Answer 2

Ok. Your confusion stems from the verb alegrarse, which uses the pronominal se. You are literally saying: "It will please us to see you again."

The subject is not NOS, it's ESO (Eso nos alegrará).