TASK DEFINITION: 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.
PROBLEM: Passage: Japan's Tomen Corp. said Thursday it had bought a 19 percent stake in Koppert Biological Systems BV, a Dutch company that breeds benign insects to protect vegetables against insect pests. The Japanese trading house has been a sales agent in Japan for the world's biggest breeder of benign insects since 1992 and sold for two years a type of bee that kills insects that thrive on tomatoes and strawberries.

SOLUTION: What event has already finished?

PROBLEM: Passage: Nine people were killed and numerous others wounded by these mines, the court heard. More than seven years after the fall of the Berlin Wall, the number of people killed in all trying to escape from East Germany is not known exactly, but according to a specialist body there were more than 860 who died in this way.

SOLUTION: What event has already finished?

PROBLEM: Passage: If the heavy outflows continue, fund managers will face increasing pressure to sell off some of their junk to pay departing investors in the weeks ahead. Such selling could erode prices of high-yield junk bonds, already weakened by a rash of corporate credit problems.

SOLUTION:
What event has already happened?