问题
选择题
________ some teenagers don't realize is ________ difficult life can be after they get addicted to drugs.
A．What; what a
B．That; how
C．What; how
D．That; what
答案
答案：C
C 考察主语介词和表语从句。第一空使用what引导主语从句，what在主语从句作为realize的宾语，第二空选用how引导表语从句，how修饰形容词difficult。