Answer:
C. Haven't
Explanation:
I figured this out by the process of elimination.
"They decided to have a wash <em>have </em>they." This sentence doesn't make sense because this is not the right word to fill in the blank.
"They decided to have a wash, didn't they." Also does not make sense because it is not the right type of past, present, or future tense.
"They decided to have a wash, haven't they." This is the only word that fits this sentence.
Is there any words and or sentences to use in order to fill in the blank?
Because this could be the sentence, I don't like being talked about behind my back.
