Question

Andrew ___lunch by the time guests arrived.
(a)finished
(b)had finished
(c)was finished
(d)has finished

Answer 1

b is the option for your question

Answer 2

Andrew had finished lunch by the time guests arrived (option b).

• The given sentence is complex where the latter part of the sentence is made using the rules of the past indefinite tense.
• The rule is to make the former sentence in the past perfect tense when the latter part is in the past indefinite.
• And in the past perfect tense, we use 'had' with the third form of the verb. So, 'had finished' is correct to fill up the given space.