Choose most appropriate option to fill in the blank: Mr Clark ________ (work) in a bank for 15 years. Then he gave it up. A. have worked B. had worked C. is working D. worked

The correct answer is D. worked.

The sentence is in the past simple tense, so we need a verb in the past simple tense. The other options are not in the past simple tense.

• A. have worked is in the present perfect tense.
• B. had worked is in the past perfect tense.
• C. is working is in the present continuous tense.

The past simple tense is used to talk about things that happened in the past and are finished. In this case, Mr Clark worked in a bank for 15 years and then he gave it up. This is a finished action, so we use the past simple tense.