Question

I am sorry I _ the notice and therefore misunderstood the message​

Answer 1

Since it has not been specified what to do with the question. It is perhaps a blan. It should be filled as shown below:

I am sorry I didn't see the notice and therefore misunderstood the message​.

Explanation

The blank required Simple Past Tense form of the verb.

Simple Past Tense is used to :

a)  talk about actions which occurred at regular intervals in the past.  

e.g. Last year I drove to Ambala once a month.

b) to talk about situations which existed for a period of time in the past.  

e.g. Thousands of years ago humans lived in caves.

c)  Talk about non-continuous actions which occurred at a definite time in the past.

e.g. India launched Mars Orbiter Mission in 2013.

Answer 2

Answer:

I AM SORRY U DIDN'T SEE THE NOTICE AND THEREFORE MISUNDERSTOOD THE MESSAGE