todah rabah tal
audio: https://forum.duolingo.com/comment/16933640
In the multiple choice it shows תודה רבהלכן טל rather than תודה רבה טל
Out of curiosity, why wouldn't this be תודה מאוד?
Because תּוֹדָה is a noun, like english "the thanks". You use מְאֹד f.e. with adjectives.