(A) before he shot and killed - Correct
(B) before the shooting and killing of - Incorrect. Tense error.
(C) before he had shot and killed - Incorrect. Sine we have a time indicator 'before', there is no need to use past perfect.
(D) prior to when he shot and killed - Incorrect. Awkward.
(E) prior to the shooting and killing of - Incorrect. Tense error.
Answer: A
(B) before the shooting and killing of - Incorrect. Tense error.
(C) before he had shot and killed - Incorrect. Sine we have a time indicator 'before', there is no need to use past perfect.
(D) prior to when he shot and killed - Incorrect. Awkward.
(E) prior to the shooting and killing of - Incorrect. Tense error.
Answer: A
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