15.　 D。作为小偷，他们从未因看见警察而如此高兴过。

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Debbie got up early last Saturday morning. She wanted 　1　 　in Green Park with some of her friends. She was very 　2　 　about it. 　3　 　she was ready, she got on her bike and 　4　 　for the park -- it was on the other side of the town. Suddenly, as she was riding fast, she 　5　 　sirens (警笛). The sound of the sirens was getting 　6　 , so Debbie looked 　7　 　her to see what was happening. As a result (结果), she fell off her bike and lay in the middle of the road. Luckily, Debbie wasn’t hurt, 　8　 　a car hit her bike. After the car 　9　 , two men got out and started running. 　10　 , a police car stopped next to the same car and three policemen got 　11　 　and started running 　12　 　the two men. One of the policemen shouted, “Stop the thieves (贼)!” 　　 　13　 　a policeman came to see Debbie. He thanked her because, in a 　14　 , she had helped them 　15　 . 1. A. goes to skate　 B. go skating　 C. going to skate　　 D. to go skating

14.　 D。门打开了，他们走出电梯。

13.　 A。警察打开电梯门。

12.　 C。这对于他们来说，的确是一个很特别的时刻。

11.　 B。此时人们还在各自的家中和家人团聚。

10.　 C。根据常识，他们把偷来的箱子当作自己的圣诞礼物。

9.　　　 D。现在分词做伴随状语。

8.　　　 A。上文已有这个词组，表示一直被关在电梯中达两小时之久。

7.　　　 B。此处took为“拿”的意思。

6.　　　 C。电梯被卡在两层楼之间。