Your answer does not require the word "en", and does not seem logical. Why shouldn't lunch be as "nutritious and good" as breakfast?
Perhaps you can find some other reasons here:
http://es.wikipedia.org/wiki/Desayuno
Answer in complete sentences.
Te gusta más comer el desayuno o el almuerzo? ¿Por qué?
My answer: Me gusta más comer en el desayuno porque es nutritivo y bueno.
2 answers
how do you respond to these qiestions plz: que comes para eldesayuno?
0 answers