问题
选择题
I don’t know ______ Apple iphone4s.
A．that she is so crazy about
B．what is she so crazy about
C．why she is so crazy about
D．how she is so crazy about
答案
答案：C
考查宾语从句的用法。I don’t know后面接问句，排除A；宾语从句使用陈述语序，排除B；how所问的是方式、程度，而本句中没有相应的词，不合语意，也排除；故选C。