In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.

Passage: McCaw, the largest provider of cellular telephone service in the U.S., already owns about 9.4% of LIN's stock. In response to BellSouth's amended pact, the Kirkland, Wash., company extended its own offer to buy 22 million LIN shares for $125 apiece, which would give McCaw a 50.3% controlling interest.
What event has already finished?