Complete the passage below with the correct form of the verb in parentheses. Then choose the correct alternative.

Ranulf Fiennes is Britain’s best known explorer, and, at 65, the perfect example of the idea that people old like they used to. He an explorer since the 1960s. He 40 years the world, from polar ice caps to deserts. He many records. In 1993, for example, he and a friend tried to cross Antarctica without help. They pulled food supplies across the ice, 1,300 miles before they had to call for help.