问题补充：
So had he been in watching the car passing by that he didn’t notice his friends..
A. disturbed
B. surprised
C. excited
D. absorbed
答案：
A. disturbed
B. surprised
C. excited
(答案→)D. absorbed
解析：disturbed 扰乱的 surprised 惊讶的excited 兴奋地absorbed一心一意的,根据题意选D,他是如此全神贯注的观看经过的汽车,因此他没注意到他的朋友们.
