15. D。下文说：我的钥匙！推断上文：你的什么？
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Mary and Peter were having a
picnic near a river when Mary noticed something flying overhead.“
1 ,” she shouted to her friends. “
That’s a spaceship up there and it’s going to 2 here.”
Frightened(吓唬) by the strange silver colored spaceship, 3 of the young people got in their 4 and drove away quickly. Peter __5_ Mary and always close to her. They, more 6 than frightened, watched the spaceship
land, saw a door open. When nobody 7 , they went to the spaceship and
looked into。In the center of the floor 8__ was a pile of food. Peter followed Mary
into the spaceship and didn’t __9_ the door close behind him. The
temperature fell quickly and the __10 young people lost consciousness(知觉).
When they woke up, they were 11 to see that they were back by the river 12 . The spaceship had gone. Their car
was nearby.
“What 13 ?” said Mary.
“Don’t ask me; perhaps we
had a 14 .” Peter said slowly. “Did you … did
you see a spaceship?”
“Yes,” said Mary. “Oh,
Peter, we 15 have seen a UFO coming from another
world.”