Multiple choice Directions: Fill in the blank with an appropriate option. They _____ rung back yet. don't didn't haven't hasn't Reveal answer Fill a bubble to check yourself C Correct answer Explanation As "rung" is the 3rd form of verb so "has/have/had" will be used. And with a plural subject (they) "haven't" will be used according to the options. Hence, " haven't" is the correct option.