问题补充：
The police questioned William closely and he finally admitted the car.
A. to steal
B. having stolen
C. to have stolen
D. steal
答案：
A. to steal
(答案→)B. having stolen
C. to have stolen
D. steal
解析：考查时态和admit的用法，偷东西这个动作已经发生，所以用完成时，admit doing sth意思“承认已经做过某事”，句子意思“警察问威廉，他最后承认偷了车”，所以选B
