I was walking along the road________ suddenly someone patted me on the shoulder from behind.
A. when
B. immediately
C. the moment
D. while
下列选项中( )可能是在二叉排序树中查找35时所比较的关键字序列。
A. 2,25,40,39,53,34,35
B. 25,39,2,40,53,34,35
C. 53,40,2,25,34,39,35
D. 39,25,40,53,34,2,35