题目

Dan studied the tracks on the ground. For the third night in a row, the adult bear had returned. Was she here because she was just looking for an easy meal? Or was she here because of the baby bear locked in the pen? If that was the reason, what did she want with the cub?Dan thought about the cub. He knew there was a lot the cub could learn from an adult bear. He did not want to disturb or interfere with the bears getting to know each other. But the cub had been brought in injured. As the cub’s guardian, Dan had a responsibility to make sure that the cub was safe. Perhaps he had been hurt by______ weekends , we go to the park ______ seven o’clock .A. On , in B. At , at C. On ,at D. To, at