My friend Matt and I arrived at the Activity Centre on Frida

My friend Matt and I arrived at the Activity Centre on Friday evening.The accommodation wasn't wonderful,but we had everything we needed (beds,blankets,food),and we were pleased to be out of the city and in the fresh air.
On Saturday morning we met the other ten members of our group.Cameron had come along with two friends,Kevin and Simon,while sisters Carole and Lynn had come with Amanda.There were some other members I didn't know.We had come from different places and none of us knew the area.
　　We knew we were going to spend the weekend outdoors,but none of us was sure exactly how.Half of us spent the morning caving while the others went rock-climbing and then we changed at lunchtime.Matt and I went to the caves(岩洞) first.Climbing out was harder than going in,but after a good deal of pushing,we were out at last.Though we were covered with mud,we were pleased and excited by what we'd done.
　　根据短文内容,选择正确答案.
　　1.The writer spent the Saturday morning _____.
A.rock-climbing　
B.sleeping　　
C.meeting friends　
D.caving
选D,根据文中说明Half of us spent the morning caving while the others went rock-climbing.Matt and I went to the caves(岩洞) first.可以判断出应该选择D.
但是,根据
On Saturday morning we met the other ten members of our group
不应该是C吗?

选D,根据文中说明Half of us spent the morning caving while the others went rock-climbing.Matt and I went to the caves(岩洞) first.可以判断出应该选择D.
Because the article says that Half of us spent the morning caving while the others went rock-climbing 在这里强调用 'spent',事实上也是caving and rock-climbing花了大量时间,对比表明'met'的时间很短
and the writer mentions 'Matt and I went to the caves(岩洞) first.'