Select the most appropriate option to fill in the blank.

He ______ done it.

shouldn't have

The correct option to fill in the blank is shouldn't have.

The sentence is expressing regret or disapproval for something that someone did. The phrase "shouldn't have" is used to express this sentiment.

The other options are incorrect.

• Should have been is used to express a wish or desire that something had happened in the past. It is not the correct word to use in this sentence because the speaker is not wishing that the person had done something, they are expressing disapproval for what the person did.
• Should had not and should not had are grammatically incorrect. The correct form of the phrase is "should not have."