Multiple choice Directions: Identify the part with an error. It is clear from the facts gathered so far that he had hand in that murder. Reveal answer Fill a bubble to check yourself C Correct answer Explanation 'That he had a hand.' The indefinite article ‘a’ is used before a singular noun which is countable when it is mentioned for the first time and represents no particular person or thing."Had a hand in' is an idiom meaning to be involved in something.