问题补充：
. I have no idea he left the party without .
A. why; noticing
B. how; being noticed
C. whether; notices
D. that; notice
答案：
A. why; noticing
(答案→)B. how; being noticed
C. whether; notices
D. that; notice
解析：考查名词性从句。句中why引导同位语从句，在从句中作原因状语。句意：我不知道为什么他离开晚会没有被注意。
